Question

If x+y = 8, x*y = 15, find the value of x^2 + y^2​

Answer 1

Answer:

Given: x+y=8 and xy=15

wkt, (x+y)²= x²+y²+2xy

now substitute the given values in it.

(8)²= x²+y²+2(15)

64= x²+y²+30

x²+y²=64-30

x²+y²=34

hope it helps u......^_^

Answer 2

Answer:

(x+y)²=(8)²

x²+2xy+y²=64 [ by using (a+b)²=a²+2ab+b²) ]

x²+(2×15)+y²=64

x²+y²+30=64

x²+y²=64-30

Therefore,x²+y²=34(Ans)

Step-by-step explanation:

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