Question

29. Find the value of x³-y³ if x-y = -7 and xy = -10​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

x-y=-7

xy=-10

so x=y-7

x=-10/y

so

y-7=-10/y

y²-7y+10=0

y²-5y-2y+10=0

y(y-5)-2(y-5)=0

(y-2)(y-5)=0

y=2,5

so

x=-2,-5

x³-y³=-133