Question

Solve the equation: x^2 + 5x + 22 = 0

A. 0

B. -2.5

C. 15.75

D. No solution

Answer 1

@douglas12 Quad equation?

Answer 2

I think so.

Answer 3

Use the quad formula : http://blogs.discovermagazine.com/loom/files/2008/07/quadratic.jpg

Answer 4

a:1
b:5
c:22

Answer 5

so is the answer B

Answer 6

to check, substitute

is (-2.5)^2 + 5(-2.5) + 22 = 0?

if yes, then you're right. if not, try again

Answer 7

No it's not 0

Answer 8

then pick another letter and keep on substituting. i for one think it's faster (only applicable in multiple choice questions)