Find the value of 27x^3+8y^3 when 3x+2y = 20 and 9 = 11
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Step-by-step explanation:
27x³ + 8y³
= (3x)³ + (2y)³
= (3x +2y)³ - 3 × 3x × 2y (3x +2y)
= ( 3x +2y)³ - 18 xy(3x + 2y)
= (20)³ - 18 ×11 (20)
= 8000 -198 × 20
= 8000 - 3960
= 4040
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