Question

Find the value of x³ + y³ +12xy + 64 when x + y = 4

Answer 1

bonjour dear!

question- x³+y³+12xy+64

given that x+y= 4

⇒then use the formula

x³ + y³ = (x + y)(x² - xy + y²)

x³ + y³ - 12xy + 64

x³ + y³ + 4³ - 3(4xy) (64 = 4³)

(x + y + 4)(x² + y² + 4² - xy - 4y - 4x)

x + y = - 4

(- 4 + 4) * (x² + y² + 4² - xy - 4y - 4x)

0 * (x² + y² + 4² - xy - 4y - 4x)

= 0

hope it helps

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Answer 2

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