Question

Compare the value of 9x² + 4y² if xy = 6 and 3x +2y = 12

Answer 1

Answer:

3x+2y=12

On squaring both sides:-

(3x+2y)^2=12^2

9x^2+4y^2+2*3x*2y=144

9x^2+4y^2+12xy=144

9x^2+4y^2=144-12xy

=144-12*6

=144-72

=72

Answer is 72

Hope it will help you.