Evaluate
-9x^{4}+15x^{2}+2xy-4
Expand
-9x^{4}+15x^{2}+2xy-4
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3x^{2}+2xy-\left(9\left(x^{2}\right)^{2}-12x^{2}+4\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x^{2}-2\right)^{2}.
3x^{2}+2xy-\left(9x^{4}-12x^{2}+4\right)
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
3x^{2}+2xy-9x^{4}+12x^{2}-4
To find the opposite of 9x^{4}-12x^{2}+4, find the opposite of each term.
15x^{2}+2xy-9x^{4}-4
Combine 3x^{2} and 12x^{2} to get 15x^{2}.
3x^{2}+2xy-\left(9\left(x^{2}\right)^{2}-12x^{2}+4\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x^{2}-2\right)^{2}.
3x^{2}+2xy-\left(9x^{4}-12x^{2}+4\right)
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
3x^{2}+2xy-9x^{4}+12x^{2}-4
To find the opposite of 9x^{4}-12x^{2}+4, find the opposite of each term.
15x^{2}+2xy-9x^{4}-4
Combine 3x^{2} and 12x^{2} to get 15x^{2}.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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}