Question

Este dat a = 9x² - 4 si b = 9x² + 12x + 4.
Simplifica raportul a/b .

Answer 1

Răspuns:

Explicație pas cu pas:

a = 9x² - 4 = (3x - 2)(3x + 2)

b = 9x² + 12x + 4 = (3x + 2)(3x + 2)

a / b = (3x - 2)(3x + 2) / (3x + 2)(3x + 2)   ( se simplifica cele subliniate )

a/b = (3x - 2) / (3x + 2)

Answer 2

Răspuns:

a=9x²-4

a=3²x²-2²

a=(3x)²-2²

a=(3x-2)(3x+2)

b=9x²+12x+4

b=3²x²+2×3x×2+2²

b=(3x)²+2×3x×2+2²

b=(3x+2)²

a/b=[(3x-2)(3x+2)]/(3x+2)²

a/b=3x-2/3x+2