Question

If 2x – 3y = 5 and xy = 4, find the value of 4x^2 + 9y^2.​

Answer 1

Answer:

4x^2+9y^2

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

=(2x-3y) ^2+2*2x*3y

=5^2+12xy

=25+12*4

=25+48

=73