Question

If x-y = 5 and xy = 7 find the value of x^3-y^3​

Answer 1

Step-by-step explanation:

$x {}^{3 } - y {}^{3} = (x - y) {}^{3} + 3xy(x - y)$

now put the value of (x-y) and xy in above formula.

$x {}^{3 } - y {}^{3} = 5 {}^{3} + 3 \times 7 \times 5 \\ = 25 + 105 \\ x {}^{3} - y {}^{3} = 130$

Answer 2

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