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CBSE Class 8 Answered

If 3x -4x=10 and xy=-1,find the value of 9x^2+16y^2
Asked by vishal7979780056 | 12 Aug, 2018, 10:45: PM
answered-by-expert Expert Answer
begin mathsize 16px style 3 straight x space minus space 4 straight y space equals space 10 Squaring space on space both space the space sides comma space we space get left parenthesis 3 straight x space minus space 4 straight y right parenthesis squared space equals space left parenthesis 10 right parenthesis squared rightwards double arrow 9 straight x squared plus space 16 straight y squared space minus space 24 xy space equals space 100 we space have comma space xy space equals space minus 1 space rightwards double arrow 9 straight x squared plus space 16 straight y squared space minus space 24 space cross times space minus 1 space equals space 100 rightwards double arrow 9 straight x squared plus space 16 straight y squared space space equals space 100 space minus space 24 rightwards double arrow 9 straight x squared plus space 16 straight y squared space space equals space 76 end style
Answered by Yasmeen Khan | 13 Aug, 2018, 10:53: AM

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CBSE 8 - Maths
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