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16-49y^{2}
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16-49y^{2}
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4^{2}-\left(7y\right)^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
16-\left(7y\right)^{2}
Calculate 4 to the power of 2 and get 16.
16-7^{2}y^{2}
Expand \left(7y\right)^{2}.
16-49y^{2}
Calculate 7 to the power of 2 and get 49.
4^{2}-\left(7y\right)^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
16-\left(7y\right)^{2}
Calculate 4 to the power of 2 and get 16.
16-7^{2}y^{2}
Expand \left(7y\right)^{2}.
16-49y^{2}
Calculate 7 to the power of 2 and get 49.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
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\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
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\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}