Question

Find the zeros of the quadratic function: y= 6(7x + 9)(8x - 3).

A) (-9/7,0), (3/8,0)
B)(-7/9,0), (8/3,0)
C) (-3/8,0), (°/7,0)
D) (-8/3,0), (7/9,0)

Answer 1

A) (-9/7,0), (3/8,0)

Explanation:

Zeros of a quadratic function:

x for which y = 0.

In this question:

`y = 6(7x + 9)(8x - 3)`

It's 0 if one of the factors is 0. 6 is never 0, now about the other to:

`7x + 9 = 0`

`7x = -9`

`x = -(9)/(7)`

So (-9/7, 0) is a zero of the quadratic function.

The other is:

`8x - 3 = 0`

`8x = 3`

`x = (3)/(8)`

(3/8,0) is the other zero.

Thus, the correct answer is given by option A.