Question

Упростите выражение:

Answer 1

$\frac{x^{2} +2x-15}{35+2x-x^{2} }=\frac{x^{2} +2x-15}{-x^{2} +2x+35}=\frac{x*(x+5)-3(x+5)}{-x^{2} +7x-5x+35} =\frac{(x+5)(x-3)}{-x(x-7)-5(x-7)} =\frac{(x+5)(x-3)}{-(x-7)(x+5)}=-\frac{x-3}{x-7}=\frac{3-x}{x-7}$