Question

if X + Y equal to 9 and xy equal to 16 find the value of x square + Y square

Answer 1

answer is 49 hope it helps u
first whole square x+y=9 then expansion the then substitute the xy value and answer is 49

Answer 2

Here is your answer......

xy=16 .........(1)

x+y=9.........(2)

squaring on both sides, we get

(x+y)^2=(9)^2

=> x^2 + 2xy + y^2=81

=>x^2+y^2 = 81 - 2xy

=> x^2 + y^2 = 81 - 2 * 16

=>x^2+y^2=81 - 32

=> x^2+y^2=49

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