Question

What are the possible values of x if (4x – 5)2 = 49? check all that apply. -4/5 -1/2 3 5 7

Answer 1

4 x - 5 = - 7
4 x = - 2
x = -$\frac{1}{2}$
or 
4 x - 5 = 7
4 x = 12
x = 3
Answer B) and C)

Answer 2

(4x-5)^2 = 49

Extract square root from both sides

4x-5 =(+/-)7

4x = 5 +7 and 4x = 5 -7

4x = 12 and 4x = -2

x = 12/4 and x = -2/4

x= 3 and x =-1/2