Skip to main content
Solve for x
Tick mark Image
Graph

Similar Problems from Web Search

Share

4\left(4-x\right)\left(x+5\right)-6\left(2-x\right)\left(x+1\right)=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Multiply both sides of the equation by 24, the least common multiple of 6,4,8,24.
\left(16-4x\right)\left(x+5\right)-6\left(2-x\right)\left(x+1\right)=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply 4 by 4-x.
-4x+80-4x^{2}-6\left(2-x\right)\left(x+1\right)=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply 16-4x by x+5 and combine like terms.
-4x+80-4x^{2}+\left(-12+6x\right)\left(x+1\right)=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply -6 by 2-x.
-4x+80-4x^{2}-6x-12+6x^{2}=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply -12+6x by x+1 and combine like terms.
-10x+80-4x^{2}-12+6x^{2}=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Combine -4x and -6x to get -10x.
-10x+68-4x^{2}+6x^{2}=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Subtract 12 from 80 to get 68.
-10x+68+2x^{2}=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Combine -4x^{2} and 6x^{2} to get 2x^{2}.
-10x+68+2x^{2}=\left(9-3x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply 3 by 3-x.
-10x+68+2x^{2}=3x+18-3x^{2}-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply 9-3x by x+2 and combine like terms.
-10x+68+2x^{2}=3x+18-3x^{2}+\left(-4x-4\right)\left(x+2\right)+83-x
Use the distributive property to multiply -4 by x+1.
-10x+68+2x^{2}=3x+18-3x^{2}-4x^{2}-12x-8+83-x
Use the distributive property to multiply -4x-4 by x+2 and combine like terms.
-10x+68+2x^{2}=3x+18-7x^{2}-12x-8+83-x
Combine -3x^{2} and -4x^{2} to get -7x^{2}.
-10x+68+2x^{2}=-9x+18-7x^{2}-8+83-x
Combine 3x and -12x to get -9x.
-10x+68+2x^{2}=-9x+10-7x^{2}+83-x
Subtract 8 from 18 to get 10.
-10x+68+2x^{2}=-9x+93-7x^{2}-x
Add 10 and 83 to get 93.
-10x+68+2x^{2}=-10x+93-7x^{2}
Combine -9x and -x to get -10x.
-10x+68+2x^{2}+10x=93-7x^{2}
Add 10x to both sides.
68+2x^{2}=93-7x^{2}
Combine -10x and 10x to get 0.
68+2x^{2}+7x^{2}=93
Add 7x^{2} to both sides.
68+9x^{2}=93
Combine 2x^{2} and 7x^{2} to get 9x^{2}.
9x^{2}=93-68
Subtract 68 from both sides.
9x^{2}=25
Subtract 68 from 93 to get 25.
x^{2}=\frac{25}{9}
Divide both sides by 9.
x=\frac{5}{3} x=-\frac{5}{3}
Take the square root of both sides of the equation.
4\left(4-x\right)\left(x+5\right)-6\left(2-x\right)\left(x+1\right)=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Multiply both sides of the equation by 24, the least common multiple of 6,4,8,24.
\left(16-4x\right)\left(x+5\right)-6\left(2-x\right)\left(x+1\right)=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply 4 by 4-x.
-4x+80-4x^{2}-6\left(2-x\right)\left(x+1\right)=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply 16-4x by x+5 and combine like terms.
-4x+80-4x^{2}+\left(-12+6x\right)\left(x+1\right)=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply -6 by 2-x.
-4x+80-4x^{2}-6x-12+6x^{2}=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply -12+6x by x+1 and combine like terms.
-10x+80-4x^{2}-12+6x^{2}=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Combine -4x and -6x to get -10x.
-10x+68-4x^{2}+6x^{2}=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Subtract 12 from 80 to get 68.
-10x+68+2x^{2}=3\left(3-x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Combine -4x^{2} and 6x^{2} to get 2x^{2}.
-10x+68+2x^{2}=\left(9-3x\right)\left(x+2\right)-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply 3 by 3-x.
-10x+68+2x^{2}=3x+18-3x^{2}-4\left(x+1\right)\left(x+2\right)+83-x
Use the distributive property to multiply 9-3x by x+2 and combine like terms.
-10x+68+2x^{2}=3x+18-3x^{2}+\left(-4x-4\right)\left(x+2\right)+83-x
Use the distributive property to multiply -4 by x+1.
-10x+68+2x^{2}=3x+18-3x^{2}-4x^{2}-12x-8+83-x
Use the distributive property to multiply -4x-4 by x+2 and combine like terms.
-10x+68+2x^{2}=3x+18-7x^{2}-12x-8+83-x
Combine -3x^{2} and -4x^{2} to get -7x^{2}.
-10x+68+2x^{2}=-9x+18-7x^{2}-8+83-x
Combine 3x and -12x to get -9x.
-10x+68+2x^{2}=-9x+10-7x^{2}+83-x
Subtract 8 from 18 to get 10.
-10x+68+2x^{2}=-9x+93-7x^{2}-x
Add 10 and 83 to get 93.
-10x+68+2x^{2}=-10x+93-7x^{2}
Combine -9x and -x to get -10x.
-10x+68+2x^{2}+10x=93-7x^{2}
Add 10x to both sides.
68+2x^{2}=93-7x^{2}
Combine -10x and 10x to get 0.
68+2x^{2}-93=-7x^{2}
Subtract 93 from both sides.
-25+2x^{2}=-7x^{2}
Subtract 93 from 68 to get -25.
-25+2x^{2}+7x^{2}=0
Add 7x^{2} to both sides.
-25+9x^{2}=0
Combine 2x^{2} and 7x^{2} to get 9x^{2}.
9x^{2}-25=0
Quadratic equations like this one, with an x^{2} term but no x term, can still be solved using the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}, once they are put in standard form: ax^{2}+bx+c=0.
x=\frac{0±\sqrt{0^{2}-4\times 9\left(-25\right)}}{2\times 9}
This equation is in standard form: ax^{2}+bx+c=0. Substitute 9 for a, 0 for b, and -25 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{0±\sqrt{-4\times 9\left(-25\right)}}{2\times 9}
Square 0.
x=\frac{0±\sqrt{-36\left(-25\right)}}{2\times 9}
Multiply -4 times 9.
x=\frac{0±\sqrt{900}}{2\times 9}
Multiply -36 times -25.
x=\frac{0±30}{2\times 9}
Take the square root of 900.
x=\frac{0±30}{18}
Multiply 2 times 9.
x=\frac{5}{3}
Now solve the equation x=\frac{0±30}{18} when ± is plus. Reduce the fraction \frac{30}{18} to lowest terms by extracting and canceling out 6.
x=-\frac{5}{3}
Now solve the equation x=\frac{0±30}{18} when ± is minus. Reduce the fraction \frac{-30}{18} to lowest terms by extracting and canceling out 6.
x=\frac{5}{3} x=-\frac{5}{3}
The equation is now solved.