Question

What are the coordinates of the x-intercepts of the graph of y = 2x2 + 6x – 20?
(–5, 0), (2, 0)
(5, 0), (–2, 0)
(–4, 0), (10, 0)
(4, 0), (–10, 0)

Answer 1

The x intercepts occur when y = 0.

So factor 2x^2 + 6x - 20 = 0

2(x^2 + 3x - 10 = 0)

x^2 + 3x - 10 = 0

Answer 2

So what answer would that be?

Answer 3

Well, try factoring x^2 + 3x - 10 = 0

Answer 4

Oh okay yeah one sec

Answer 5

(5,0) (-2,0)?

Answer 6

Oh my bad negative 5 positive 2

Answer 7

Yup :)

Answer 8

Thanks :)