Question

(4x+5)²-(3x+4)²=0
Решите уравнение за 7 класс.

Answer 1

( 4x + 5 )^2 - ( 3x + 4 )^2 = 0 
( 4x + 5 + 3x + 4 )( 4x + 5 - 3x - 4 ) = 0
( 7x + 9 )( x + 1 ) = 0
7x + 9 = 0
x = - 9/7 = - 1 2/7 
x + 1 = 0
x = - 1