Question

If x2 + y2 = 12 and xy = 2, Find the value of x + y

Answer 1

Step-by-step explanation:

XY=2

X=2/y

2/y.2+2y=12

4/y+2y=12

Answer 2

Answer:

GIVEN:- xy = 12

( x + y)^2 = 12

Formula => ( a + b )^2 = a^2 + 2ab + b^2

we apply formula in this question

=> x^2 + 2×x×y + y^2 = 12

=> ( x + y )^2 + 2×2 = 12

=> ( x + y )^2 + 4 = 12

( x + y )^2 = 12 - 4

x + y = under root of 8

x + y = 2.83 approx

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