Question

== ==if 3x - 2y =6 and xy = 6 find value of 9x² + 4y²​

Answer 1

Answer:

3x+2y=12

Squaring both sides, we get

(3x+2y) 2 =14y

⇒9x 2 +4y 2

+2×3x×2y=144

⇒9x 2 +4y 2

=144−12xy

⇒9x 2 +4y 2

=144−12×6 since xy=6

⇒9x 2 +4y 2

=144−72=72

∴9x

2 +4y 2 =72