Question

Produtos notáveis. Resolva (5x-7).(5x-7)

Answer 1

(5x-7)(5x-7)
5x*5x+5x*(-7) +(-7)*5x+(-7)*(-7) 
25x²-35x-35x+49
25x²-70x+49

Answer 2

(5X-7).(5X-7)
10X-35X-35X+49
10X-70X+49
-60X=-49
X=-49/-60
X=0,8166666...