Question

solve the equation using the quadratic formula. then solve the equation by factoring to check your solution(s). 3x^2+7x-24=13x please explain

Answer 1

which part do you have problems with, the factoring or the quadratic formula?

Answer 2

do you know the quadratic formula?

Answer 3

yes. I need help on the factoring part

Answer 4

ok well just to make sure you do know you have to make the equation = 0

Answer 5

so, 3x^2-6x-24=0

Answer 6

yes

Answer 7

now how do you factor with a number other than 1 for a

Answer 8

a would always be the number e.g. 3x in one bracket and x in the other to give it 3x^2

Answer 9

(3x- )(x+ )
and the blanks have to add to 6? or 24?

Answer 10

yes have to add to -6x and multiply to be + 24 (remember - multiplied by - gives +)

Answer 11

i've learnt that the only way to factorise is through trial and error unless someone else knows a different way

Answer 12

so I need to find factors of 24 that subtract to 6…right?

Answer 13

yes you need to find factors of 24 that add to give you -6

Answer 14

would (3x-12)(x+6) work?

Answer 15

because you have to multiply by the 3 too

Answer 16

- 12 * 6 would not give you 24

Answer 17

sorry -24 is what you need

Answer 18

i misread the equation

Answer 19

but 3x times x=3x^2, 3x times 6=18x, -12 times x=-12x, and -12 times 6 =…oh nevermind

Answer 20

haha

Answer 21

but i can say your on the right tracks
try and change the number you have in the second bracket and it should fix it

Answer 22

sorry - 12 * something should give - 24

Answer 23

-2

Answer 24

+2

Answer 25

2

Answer 26

yes

Answer 27

try that

Answer 28

(3x-12)(x+2)=3x^2+6x-12x-24=3x^2-6-24

Answer 29

-6x not -6 but yes thats correct

Answer 30

thanks so much. i have a quiz on this tomorrow and i didn't get it, but now i do! Oh right, 6x.

Answer 31

your welcome :p dont forget to click good answer ;)