Question

Сократите дробь (5х+3)²-(5х-3)²/х

Answer 1

$\frac{ (5x+3)^{2}- (5x-3)^{2} }{x} = \frac{25 x^{2} +30x+9-(25 x^{2}-30x+9) }{x}= \frac{25 x^{2} +30x+9-25 x^{2}+30x-9 }{x} = \frac{60x}{x} =60$