Question

if 3x-7y =10 and xy = -1 , find the value of 9x² + 49y​

Answer 1

(3x-7y)²=(3x)²+(7y)²-2(xy)

10²=9x²+49y²-2(-1)

100=9x²+49y²+2

9x²+49y²=98

hope it helps mark as brainliest