Use the quadratic formula to find the roots of the equation. x2 + 3x - 18 = 0
A. {-6, 3}
B. {-2, 9}
C. {-3, 6}
D. {-9, 2}

Question

Use the quadratic formula to find the roots of the equation. x2 + 3x - 18 = 0
	A.	{-6, 3}
	B.	{-2, 9}
	C.	{-3, 6}
	D.	{-9, 2}

saifoo.khan · Answer

A for apple

hero · Answer

x^2 + 3x - 18 = 0
x^2+6x-3x - 18 = 0
x(x+6)-3(x+6) = 0
(x+6)(x-3) =0

x = -6,3

Rule of thumb: Don't use the quadratic formula if you don't have to.

anonymous · Answer

$$x=\frac{-3 \pm \sqrt{3^2-4*1*(-18)}}{2(1)}$$$$x=\frac{-3 \pm \sqrt{9+72}}{2}$$$$x=\frac{-3 \pm \sqrt{81}}{2}$$$$x=\frac{-3-9}{2}=-6$$or$$x=\frac{-3+9}{2}=3$$And as saifoo and hero already said the answer is A

anonymous · Answer

Rule of pinky: follow directions

hero · Answer

Sorry, I'm just doing what I was taught. My teacher said use the quadratic formula as last resort.

anonymous · Answer

personally, i hate the quadratic formula!

hero · Answer

I hate it worse than you do. I don't even use it anymore.

hero · Answer

I'll never use it again ever in my life.

anonymous · Answer

ok, you are bigger anti-quadratic-formula-ite

jamesj · Answer

@bates12: you've been handed the answer on a silver platter.

But let me ask you: do you know what the quadratic equation is?