Question

решите уровнения (x+7)^2-(x-4)(x+4)=65

Answer 1

x^2 + 14x + 49 - ( x^2 - 16) = 65
x^2 + 14x + 49 - x^2 + 16 = 65
14x = 65 - 65
14x = 0
x = 0

Answer 2

$(x+7)^2-(x-4)(x+4)=65$

$x^2+14x+49-(x^2-16)-65=0$

$x^2-x^2+14x+49+16-65=0$

$14x=0$

$x=0$.