Question

Need some help (: thanks!

Consider the quadratic equation below. (4x+z)(3x-w)=0
If w=21, determine an x-intercept of the parabola represented by this equation.
A) (21,0)
B) (-7,0)
C) (-21,0) or D) (7,0)

Answer 1

We know that w = 21 so:

`(4x+z)(3x-w)=0\\\\(4x+z)(3x-21)=0\\\\3x-21=0\\\\3x=21\qquad|/3\\\\\boxed{x=7}`

Answer D) (7;0)