Question

subpunctul f va rog frumos.. trebuie restrânsă ecuația

Answer 1

25 ( x - 6)^2  - 49 = 5^2 (x - 6)^2 - 7^2 = (5x-30 -7) ( 5x - 30 +7) =(5x-37)(5x-23)

Answer 2

$\boxed{ Folosim formula: \quad a^2-b^2 = (a-b)(a+b)} \\ \\ 25(x-6)^2 -49 = 5^2(x-6)^2-7^2 = \big[5(x-6)\big]^2 - 7^2 = \\ =\big[5(x-6) -7\big]\big[5(x-6) +7\big]= (5x-30-7)(5x-30+7) = \\ =(5x-37)(5x-23)$