Question

2x + 3y = 81 and xy = 6, find 4x^2 + 9y^2

Answer 1

Step-by-step explanation:

(2x+3y)^2 = (2x)^2+(3y)^2 +6xy

(81)^2 = 4x^2 + 9y^2 + 36

6561 - 36 = 4x^2 + 9y^2

6525 = 4x^2 + 9y^2