Please help me with 39 question
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Now,
7x³ + 8y³ - (4x + 3y) (16x² - 12xy + 9y²)
= 7x³ + 8y³ - {(4x)³ + (3y)³},
using the identity
a³ + b³ = (a + b) (a² - ab + b²)
= 7x³ + 8y³ - (64x³ + 27y³)
= 7x³ + 8y³ - 64x³ - 27y³
= (7 - 64)x³ + (8 - 27)y³
= - 57x³ - 19y³
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the answer is -19(3x^3+y^3)
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