16x^2-(4x-5)^2=15 (^2 в квадрате)

Question

16x^2-(4x-5)^2=15
(^2 в квадрате)

Answer 1

16x^2 - 16x^2 + 40x - 25 = 15
(16x^2 сокращаются)
40x = 40
x=1

Answer 2

16x^2-(4x-5)^2=15
16x^2-16x^2+40x-25-15=0
40x-40=0
40x=40
x=1