Question

if x +y =7 and x^2 + y^2 = 25 find the value of x^3+y^3​

Answer 1

Answer:

square on both sides

(x+y)^2=x^2+y^2+2xy

xy=12

(x+y)^3=x^3+y^3+3xy(x+y)

substitute the values

7^3=x^3+y^3+12(7)

x^3+y^3=91

Step-by-step explanation:

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Answer 2

Answer:

is 26

Step-by-step explanation:

x+y=7

X2+y2=25

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