Question

What are the solutions of the quadratic equation?
x2 + 11x = –24 (Multiple Choice)

◘ -3, -8
◘ -3, 8
◘ 3, -8
◘ 3, 8

Answer 1

1st step?

Answer 2

That is actually x^2

Answer 3

try and i will help

Answer 4

I have no idea where to even start with this, honestly.

Answer 5

you need to make it look like this

x^2 + bx + c =0

Answer 6

Umm, how do you do that?

Answer 7

x^2 + 11x = –24
add 24 to both sides

Answer 8

so its x^2 + 11x + 24 = 0 ?

Answer 9

yes

Answer 10

now what are the 2 numbers that
what numbers can make 24 a*b

Answer 11

8 and 3

Answer 12

so its (x + 3)(x + 8) = 0

Answer 13

yes
but -3 and -8 also make 24, why did you choose 8 and 3

Answer 14

Because they add together to equal 11.. isnt that what you do when factoring?

Answer 15

correct
(x + 3)(x + 8) = 0
now
what will make this function true?

Answer 16

I don't really know what to do from this point.

Answer 17

(x + 3)(x + 8) = 0
x = -3
(-3 + 3)(x + 8) = 0
0(x + 8) = 0
right?

Answer 18

Why does x= -3

Answer 19

to make the function = 0
you need 0*a=a
so -3 + 3 = 0
and -8 +8 =0

Answer 20

okay. . .

Answer 21

Okay, I understand now, so the solutions are -3 and 8?

Answer 22

the question is not asking for factoring it asks for the solution

(x + 3)(x + 8) = 0 is factoring
but how to make the left hand side equal to zero

Answer 23

why 8?

Answer 24

Because thats how I saw it in the equation, is it not 8?

Answer 25

ok lets plug it
x= 8
(x + 3)(x + 8) = 0
(8 + 3)(8 + 8) = 0
(11)(16) = 0 ? is it true?

Answer 26

oh, no.

Answer 27

So its -8

Answer 28

you got it
-3,-8

Answer 29

Okay, thank you so much.

Answer 30

1. a
2.c
3.a
4.d
5.d
100% qc

Answer 31

yeah she's right just try it

Answer 32

She is right i just got it right

Answer 33

100% CORRECT