Сократите дробь.(3х+7)^2 - (3х-7)^2_____________ х

Question

Сократите дробь.

(3х+7)^2 - (3х-7)^2
_____________
х

Answer 1

((3х+7)^2 - (3х-7)^2)/x = (9x^2+21x+49-9x^2+21x-49)/x = 42x/x=42