linnie820 linnie820

05-12-2020
Mathematics

contestada

Use factoring to find the zeros of the following function:
f(x)=5x^3-7x^2-45x+63

Respuesta :

zanyar23 zanyar23

05-12-2020

Answer:

-3, +3, 7/5

Step-by-step explanation:

(5x³-7x²)+(-45x+63)=0

X²(5x-7)-9(5x-7)=0

(X²+9)(5x-7)=0

Either x²-9=0

X²=9 so x=+3 and -3

Or 5x-7=0

5x=7 so x=1.4 (or 7/5)

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