Помогите решить алгебру)). Created by HOPE111. matematika-ru

Помогите решить алгебру))...

kratgv

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(3х+7)²-(3х-7)² 9х²+42х+49-9х²+42х-49
--------------------- = ------------------------------------ =
х х
84х
= ----- = 84
х

3 votes Thanks 2

helenaal

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(3х + 7)² -(3х - 7)²] / х = 84

В числителе разность квадратов чисел: а² - в² = (а + в)*(а-в) у нас а = (3х+7); в = (3х - 7)

{[(3х + 7) + (3х - 7)] * [(3x + 7) - (3x - 7)]} / x = [(3х + 7 + 3х - 7) * (3х + 7 - 3 х + 7)] / x = (6x *14) / x = 84

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