What is expand-(sqrt(pi)+4)(sqrt(pi)-4)r^2 ?

The solution to expand-(sqrt(pi)+4)(sqrt(pi)-4)r^2 is -pir^2+16r^2

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expand-(sqrt(pi)+4)(sqrt(pi)-4)r^2

expand

- (π + 4) (π - 4) r^{2}

- π r^{2} + 16 r^{2}

Solution steps

- (π + 4) (π - 4) r^{2}

Expand

(π + 4) (π - 4) : π - 16

= - r^{2} (π - 16)

Expand

- r^{2} (π - 16) : - π r^{2} + 16 r^{2}

= - π r^{2} + 16 r^{2}

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What is expand-(sqrt(pi)+4)(sqrt(pi)-4)r^2 ?
The solution to expand-(sqrt(pi)+4)(sqrt(pi)-4)r^2 is -pir^2+16r^2