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do you know the quadratic formula?

no..i don think so?

ok we can try to factor it then

yeah thats what im doing..i have to factor it

a=4, b=8, c=-21
Find factors of a*c that add up to be b

what is a*c?

a*c=-84

-8 yeah

but we want 8
how can we get 8

what if you said a*c=-6(14)
what is the sum of those two factors?

...8!

right!

now replace the bx term with what you just found but you need an x behind each term so it equals bx

4x^2+14x-6x-21=0

ohhh okay then you have to group it right?

right!

so then it would be(4x^2+14x)(-6x-21)=0 which then what?

no!

what??

what do 4x^2 and 14x have in common?____________
what do -6x and -21 have in common?___________

4x
? idk

you still there?

we are almost there

yeha ohh aha i would have never thought of that..

then you do 2x-3=0 and 2x+7=0..

right

you got that part?
was the factoring the problem you were having?

then the answer is x=2/3 and x=2/7!!

omg thanks soo much for your help!! haha sorry that took me forever to figure out:/ thanks though!

x=2/3 is right but x=-7/2 for the second one