Question

(7-x)^2-(x+8)(x-8)=43

Answer 1

$(7-x)^2-(x+8)(x-8)=43 \ 49-14x+ x^{2} -( x^{2} -64)=43 \ 49-14x+ x^{2} - x^{2} +64=43 \ -14x=43-49-64 \ -14x=-70 \ x=5 \ Otvet:x=5$