Question

Factor using the quadratic formula:

x^2+x-30

Answer 1

\[30=(-5) \times 6\]

Answer 2

Roots of quadratic equation \[ax ^{2}+bx+c=0\]

\[x=\frac{ -b \pm \sqrt{b ^{2}-4ac} }{ 2a }\]

Answer 3

Ah, thats what I was doing wrong. For some reason I was plugging the variables into the equation, not the coefficients. That's why it didn't make any sense. Thanks! I think I can get it from here.

Answer 4

you're welcome...:)

Answer 5

Hmm I started working through, and I came up with this:

\[\frac{ -1\pm \sqrt{120} }{ 2 }\]

Now I'm not quite sure what to do with it, am I at least on the right track?

Answer 6

\[x=\frac{ -1\pm \sqrt{1-4*1*(-30)} }{ 2 }=\frac{ -1\pm \sqrt{1+120} }{ 2 }\]

Answer 7

here, a=1 b=1 and c=-30
just plug in the values and find the value of x.

Answer 8

Bah, missed a step. Thanks again!

Answer 9

don't mention.

Answer 10

(x-5)(x+6) :)