I need help with this...
Solve by Factoring and provide "Exact" answers "Only":
12x^2 + 15x - 4 = 0
We're supposed to use this thing our teacher calls "The Big-X and the Square", it's not in the textbook and I'm not sure if anyone is familiar with it. I'll try to explain it.

Question

I need help with this...
Solve by Factoring and provide "Exact" answers "Only":
12x^2 + 15x - 4 = 0
We're supposed to use this thing our teacher calls "The Big-X and the Square", it's not in the textbook and I'm not sure if anyone is familiar with it. I'll try to explain it.

anonymous · Answer

I know it !

anonymous · Answer

multiply the coefficient of x^2 and the free term -4 -> this is the product , the sum is the coefficient of the middle term 15

anonymous · Answer

Is that where you draw four squares in order to try to factor it out?

anonymous · Answer

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anonymous · Answer

@mathg8 Yeah, but what factors of -48 equal 15? That's my problem.
@Romero Yes. Yes it is.

anonymous · Answer

oh ...I see ...she wants you to solve by completing the square?

anonymous · Answer

OH. OKAY!!! I... forgot about that. xD

anonymous · Answer

do you know how?

anonymous · Answer

Yeah. Well, tanks for reminding me anyways :D

anonymous · Answer

you're welcome ... tell your teacher that factoring doesn't really work , unless you're using the quadratic formula to find the solutions and then put them in factor form.

anonymous · Answer

Okai ^_^ I will!