Evaluate
3x\left(3x+4\right)
Expand
9x^{2}+12x
Graph
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9x^{2}+24x+16-4\left(3x+4\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+4\right)^{2}.
9x^{2}+24x+16-12x-16
Use the distributive property to multiply -4 by 3x+4.
9x^{2}+12x+16-16
Combine 24x and -12x to get 12x.
9x^{2}+12x
Subtract 16 from 16 to get 0.
9x^{2}+24x+16-4\left(3x+4\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3x+4\right)^{2}.
9x^{2}+24x+16-12x-16
Use the distributive property to multiply -4 by 3x+4.
9x^{2}+12x+16-16
Combine 24x and -12x to get 12x.
9x^{2}+12x
Subtract 16 from 16 to get 0.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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y = 3x + 4
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Matrix
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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}