answersLogoWhite

0


Best Answer

We have the following quadratic equation:

y= x2 + 8x + 15

We need to find the x-intercepts of the equation, or the points where the equation equals zero. To do this, we can factor the equation. Take the following equation:

y = (x + a)(x + b)

We can factor the equation into this form, if we can find numbers a and b such that:

a + b = 8

a * b = 15

After some trial and error, we find that a = 3 and b = 5.

x2 + 8x + 15 = (x + 3)(x + 5)

If either part of the factored form is equal to zero, the entire equation is equal to zero. The points where this is true are at x = -3 and x = -5. Therefore, the answers are

x = -3 and x = -5.

User Avatar

Wiki User

15y ago

Still curious? Ask our experts.

Chat with our AI personalities

BlakeBlake
As your older brother, I've been where you are—maybe not exactly, but close enough.
Chat with Blake
FranFran
I've made my fair share of mistakes, and if I can help you avoid a few, I'd sure like to try.
Chat with Fran
LaoLao
The path is yours to walk; I am only here to hold up a mirror.
Chat with Lao

Add your answer:

Earn +20 pts
Q: X2 plus 8x plus 15 equals 0?
Write your answer...
Submit
Still have questions?
magnify glass
imp