rayray21
Find the product: (5x4y)^2



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saifoo.khan
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(5x4y)(5x4y)
FOIL

fiddlearound
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or
(ab)^2=a^22ab+b^2

rayray21
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so the answer is 25x^2+16y^2

saifoo.khan
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25 x^240 x y+16 y^2

smartass
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(5x)(5x)= 25x^2
(5x)(4y)= 20xy
(4y)(4y)=16y^2
(4y)(5x)=20xy
25x^240xy+16y^2

starfish33
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25x^240xy+16y^2