Evaluate
\left(4x-5\right)\left(4x+3\right)
Expand
16x^{2}-8x-15
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16x^{2}-8x+1-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4x-1\right)^{2}.
16x^{2}-8x-15
Subtract 16 from 1 to get -15.
16x^{2}-8x+1-16
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4x-1\right)^{2}.
16x^{2}-8x-15
Subtract 16 from 1 to get -15.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
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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
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Limits
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