Solve for x
x=-3
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\left(2x\right)^{2}-1=\left(4x+5\right)\left(x-2\right)
Consider \left(2x-1\right)\left(2x+1\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Square 1.
2^{2}x^{2}-1=\left(4x+5\right)\left(x-2\right)
Expand \left(2x\right)^{2}.
4x^{2}-1=\left(4x+5\right)\left(x-2\right)
Calculate 2 to the power of 2 and get 4.
4x^{2}-1=4x^{2}-3x-10
Use the distributive property to multiply 4x+5 by x-2 and combine like terms.
4x^{2}-1-4x^{2}=-3x-10
Subtract 4x^{2} from both sides.
-1=-3x-10
Combine 4x^{2} and -4x^{2} to get 0.
-3x-10=-1
Swap sides so that all variable terms are on the left hand side.
-3x=-1+10
Add 10 to both sides.
-3x=9
Add -1 and 10 to get 9.
x=\frac{9}{-3}
Divide both sides by -3.
x=-3
Divide 9 by -3 to get -3.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}