Question

Solve. 2x2 + x = 15.

Answer 1

is that 2x squared?

Answer 2

Yes sir!

Answer 3

so -3 is one solution, still working on the other

Answer 4

ya

Answer 5

\[2x^2+x=15\]-15 -15\[2x^2+x-15=0\]
I get this far, then I can't get it to foil. It should be able to go into a (2x-a)(x+b) format, but a and b won't add up.

Answer 6

@above some quadratic equations cannot be factored :)

Answer 7

Quadratic Formula! Of course!

Answer 8

so we use the quadratic formula, or synthetic division since i already got one solution

Answer 9

(-b +- sqrt(b^2-4ac))/2a

Answer 10

ill use synthetic you use formula see if we get same answer

Answer 11

it has a remainder in synth div.

Answer 12

I got\[x=2.5,-3\]

Answer 13

same here

Answer 14

whoaaa i was way off thank you guys so much this is one amazing website! thank you sooo much for putting your time and effort i really appreiciate it!

Answer 15

No problem

Answer 16

;D