Question

expand (7x-5y)3 by formula

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Answer 1

Answer:

(5y−3x−9)−(7x+5y−3)

=5y−3x−9−7x−5y+3

=−10x−6

Answer 2

$\large{\bold{\huge{\overbrace{\underbrace{ANSWER:}}}}}$

we know, $(a-b)^3 = a^3-b^3-3ab(a-b)$

using this formula,

$(7x-5y)^3 = (7x)^3-(-5y)^3-3(7x)(-5y)(7x-5y)$

= $343x^3+125y^3+105xy(7x-5y)$

= $343x^3+125y^3+735x^2y-525xy^2$

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