Evaluate
\left(2a-5b\right)\left(2a+3b\right)
Expand
4a^{2}-4ab-15b^{2}
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4a^{2}-10ab+6ba-15b^{2}
Apply the distributive property by multiplying each term of 2a+3b by each term of 2a-5b.
4a^{2}-4ab-15b^{2}
Combine -10ab and 6ba to get -4ab.
4a^{2}-10ab+6ba-15b^{2}
Apply the distributive property by multiplying each term of 2a+3b by each term of 2a-5b.
4a^{2}-4ab-15b^{2}
Combine -10ab and 6ba to get -4ab.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
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Linear equation
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
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