Question

(x+7)(x-7)-(x-3)^2=53
в общем
алгебра
уравнения...........................................

Answer 1

$(x+7)(x-7)-(x-3)^2=53\x^2-49-(x^2-6x+9)=53\x^2-49-x^2+6x-9=53\6x-58=53\6x=53+58\6x=111\x=111/6\x=18,5$