Question

Помогите пожалуйста срочно
(х-9)^2=(х+4)^2

Answer 1

(х-9)^2=(х+4)^2

x^2 - 18x + 81 = x^2 + 8x + 16

x^2 - 18x _ x^2 -8x = 16 - 81
-26x = - 65
x=2,5

Answer 2

(x-9)²-(x+4)²=0
x²-18x+81-(x²+8x+16)=0
x²-18x+81-x²-8x-16=0
65-26x=0
-26x=-65
x=65/26=2,5