InterviewSolution
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InterviewSolution
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If x+y=8 and xy=15 then find the value of x^2+y^2 Please answer my question... |
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Answer» 50-1+100-50-50=?? 36 x +y = 8xy = 15 x+y =8 Squaring both side (x+y)^2={8}^2 x^2+y^2+2xy=64…........(xy=15)x^2+y^2+30=64x^2+y^2=64-30x^2+y^2=34 x x + y = 8 ............ (i)xy = 15 ........... (ii)(x+y)2 = 82x2 + y2 + xy = 64x2 + y2 + 15 = 64x2 + y2 = 64 - 15x2 + y2 = 49 |
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