Question

If 3x-2y =4 and xy= 2, find the value of (3x+ 2y )?​

Answer 1

Answer:

+8 , -8

Step-by-step explanation:

Use: (a+b)^2 - (a-b)^2 = 4ab

Therefore,

(3x+2y)^2 - 16 = 4*3x*2y

(3x+2y)^2 - 16 = 24*2

(3x+2y)^2 = 48 + 16 = 64

3x + 2y = +8 or -8