Question

Сократи дробь c2−5c−5√.

Answer 1

$\frac{c^{2}-5 }{c-\sqrt{5}}=\frac{c^{2}-(\sqrt{5})^{2}}{c-\sqrt{5}}=\frac{(c-\sqrt{5})(c+\sqrt{5})}{c-\sqrt{5}}=c+\sqrt{5}$