Question

x + y = 15 and xy=20 and
find the value of x2 + y2​

Answer 1

Answer:

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

(15)^2= x^2+ y^2 +2×56

225= x^2+ y^2 +112

so, x^2+ y^2 = 225-112

therefore

x^2+ y^2 = 113

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Answer 2

Answer:

xy=20

and x+y=15

squaring both side

(x+y)^2=225

x^2+y^2+2xy=225

x^2+y^2+40=225

x^2+y^2=225/40

x^2+y^2=45/8

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