Question

if 2x+3y=4 and xy=-1 then find 4x²+9y²



please help ​

Answer 1

Answer:

identity

a²+b²=(a+b)²-2ab

(2x) ²+(3y) ²=(2x+3y) ²- 2.2x.3y

=4²-12.1

=16-12

=4