Question

Which of the following are solutions to the quadratic equation below?

Check all that apply.

x2 + 7x - 8 = 0

A. -4
B. 1
C. 6
D. -8
E. 2
F. -1

Answer 1

How many solutions would you expect?

Answer 2

2

Answer 3

right

can you factor the expression?

Answer 4

Maybe like (x+8) and (x-1) ?

Answer 5

That would make sense

Answer 6

So those are where your solutions come from... the whole expression is equal 0 (which is what a solution means) when either factor is equal to 0, since they are multiplied together.

Answer 7

So (x+8) is equal 0 when x = -8, and (x-1) = 0 when x= 1

So your solutions are x=-8 and x=-1

And you should always check that by sticking them back into the main equation, one at a time to see if you get zero.

Answer 8

OOPS. x=-8 and x=1 not -1 Sorry!!!

Answer 9

typing too fast...

Answer 10

Yes, makes sense. Thank you very much! I just hate not doing math for awhile and forgetting the stuff and I know. That's what I put!

Answer 11

Getting back into math?

Answer 12

Yeah, I did great when I'm consistent about it. It's been almost a year since I've done A2

Answer 13

It's hard without doing it continually... good luck!

Answer 14

Indeed it is, thanks man!