Skip to main content
Solve for x
Tick mark Image
Graph

Similar Problems from Web Search

Share

\left(x+5\right)x-\left(x-5\right)\times 9=50
Variable x cannot be equal to any of the values -5,5 since division by zero is not defined. Multiply both sides of the equation by \left(x-5\right)\left(x+5\right), the least common multiple of x-5,x+5,x^{2}-25.
x^{2}+5x-\left(x-5\right)\times 9=50
Use the distributive property to multiply x+5 by x.
x^{2}+5x-\left(9x-45\right)=50
Use the distributive property to multiply x-5 by 9.
x^{2}+5x-9x+45=50
To find the opposite of 9x-45, find the opposite of each term.
x^{2}-4x+45=50
Combine 5x and -9x to get -4x.
x^{2}-4x+45-50=0
Subtract 50 from both sides.
x^{2}-4x-5=0
Subtract 50 from 45 to get -5.
a+b=-4 ab=-5
To solve the equation, factor x^{2}-4x-5 using formula x^{2}+\left(a+b\right)x+ab=\left(x+a\right)\left(x+b\right). To find a and b, set up a system to be solved.
a=-5 b=1
Since ab is negative, a and b have the opposite signs. Since a+b is negative, the negative number has greater absolute value than the positive. The only such pair is the system solution.
\left(x-5\right)\left(x+1\right)
Rewrite factored expression \left(x+a\right)\left(x+b\right) using the obtained values.
x=5 x=-1
To find equation solutions, solve x-5=0 and x+1=0.
x=-1
Variable x cannot be equal to 5.
\left(x+5\right)x-\left(x-5\right)\times 9=50
Variable x cannot be equal to any of the values -5,5 since division by zero is not defined. Multiply both sides of the equation by \left(x-5\right)\left(x+5\right), the least common multiple of x-5,x+5,x^{2}-25.
x^{2}+5x-\left(x-5\right)\times 9=50
Use the distributive property to multiply x+5 by x.
x^{2}+5x-\left(9x-45\right)=50
Use the distributive property to multiply x-5 by 9.
x^{2}+5x-9x+45=50
To find the opposite of 9x-45, find the opposite of each term.
x^{2}-4x+45=50
Combine 5x and -9x to get -4x.
x^{2}-4x+45-50=0
Subtract 50 from both sides.
x^{2}-4x-5=0
Subtract 50 from 45 to get -5.
a+b=-4 ab=1\left(-5\right)=-5
To solve the equation, factor the left hand side by grouping. First, left hand side needs to be rewritten as x^{2}+ax+bx-5. To find a and b, set up a system to be solved.
a=-5 b=1
Since ab is negative, a and b have the opposite signs. Since a+b is negative, the negative number has greater absolute value than the positive. The only such pair is the system solution.
\left(x^{2}-5x\right)+\left(x-5\right)
Rewrite x^{2}-4x-5 as \left(x^{2}-5x\right)+\left(x-5\right).
x\left(x-5\right)+x-5
Factor out x in x^{2}-5x.
\left(x-5\right)\left(x+1\right)
Factor out common term x-5 by using distributive property.
x=5 x=-1
To find equation solutions, solve x-5=0 and x+1=0.
x=-1
Variable x cannot be equal to 5.
\left(x+5\right)x-\left(x-5\right)\times 9=50
Variable x cannot be equal to any of the values -5,5 since division by zero is not defined. Multiply both sides of the equation by \left(x-5\right)\left(x+5\right), the least common multiple of x-5,x+5,x^{2}-25.
x^{2}+5x-\left(x-5\right)\times 9=50
Use the distributive property to multiply x+5 by x.
x^{2}+5x-\left(9x-45\right)=50
Use the distributive property to multiply x-5 by 9.
x^{2}+5x-9x+45=50
To find the opposite of 9x-45, find the opposite of each term.
x^{2}-4x+45=50
Combine 5x and -9x to get -4x.
x^{2}-4x+45-50=0
Subtract 50 from both sides.
x^{2}-4x-5=0
Subtract 50 from 45 to get -5.
x=\frac{-\left(-4\right)±\sqrt{\left(-4\right)^{2}-4\left(-5\right)}}{2}
This equation is in standard form: ax^{2}+bx+c=0. Substitute 1 for a, -4 for b, and -5 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{-\left(-4\right)±\sqrt{16-4\left(-5\right)}}{2}
Square -4.
x=\frac{-\left(-4\right)±\sqrt{16+20}}{2}
Multiply -4 times -5.
x=\frac{-\left(-4\right)±\sqrt{36}}{2}
Add 16 to 20.
x=\frac{-\left(-4\right)±6}{2}
Take the square root of 36.
x=\frac{4±6}{2}
The opposite of -4 is 4.
x=\frac{10}{2}
Now solve the equation x=\frac{4±6}{2} when ± is plus. Add 4 to 6.
x=5
Divide 10 by 2.
x=-\frac{2}{2}
Now solve the equation x=\frac{4±6}{2} when ± is minus. Subtract 6 from 4.
x=-1
Divide -2 by 2.
x=5 x=-1
The equation is now solved.
x=-1
Variable x cannot be equal to 5.
\left(x+5\right)x-\left(x-5\right)\times 9=50
Variable x cannot be equal to any of the values -5,5 since division by zero is not defined. Multiply both sides of the equation by \left(x-5\right)\left(x+5\right), the least common multiple of x-5,x+5,x^{2}-25.
x^{2}+5x-\left(x-5\right)\times 9=50
Use the distributive property to multiply x+5 by x.
x^{2}+5x-\left(9x-45\right)=50
Use the distributive property to multiply x-5 by 9.
x^{2}+5x-9x+45=50
To find the opposite of 9x-45, find the opposite of each term.
x^{2}-4x+45=50
Combine 5x and -9x to get -4x.
x^{2}-4x=50-45
Subtract 45 from both sides.
x^{2}-4x=5
Subtract 45 from 50 to get 5.
x^{2}-4x+\left(-2\right)^{2}=5+\left(-2\right)^{2}
Divide -4, the coefficient of the x term, by 2 to get -2. Then add the square of -2 to both sides of the equation. This step makes the left hand side of the equation a perfect square.
x^{2}-4x+4=5+4
Square -2.
x^{2}-4x+4=9
Add 5 to 4.
\left(x-2\right)^{2}=9
Factor x^{2}-4x+4. In general, when x^{2}+bx+c is a perfect square, it can always be factored as \left(x+\frac{b}{2}\right)^{2}.
\sqrt{\left(x-2\right)^{2}}=\sqrt{9}
Take the square root of both sides of the equation.
x-2=3 x-2=-3
Simplify.
x=5 x=-1
Add 2 to both sides of the equation.
x=-1
Variable x cannot be equal to 5.