Question

Solve. 3x2 = –15x + 21

Answer 1

*3x^2 = -15x +21

Answer 2

3x^2+15x-21=0
x^2+5x-7=0
quadratic formula time with a=1, b=5, c=-7
You remember the quadratic formula, right?

Answer 3

Yes i do (:

Answer 4

That's all you can do here since it's not factorable. Just plug in the numbers.

Answer 5

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

Answer 6

Ohhh i understand now. Thank you

Answer 7

no prob