Math, asked by kartik4919, 1 day ago

If 3x-7y= 8 and xy=-1, then this find the value of 9x²+49y²

Answers

Answered by deekshadhawan0522
0

Answer:

3x-7y =8

squaring both the side we get

(3x-7y)^2 = (8)^2

9x^2+49y^2 -42xy = 64

9x^2+49y^2 = 64 + 42 [xy=1]

= 106

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