Question

What is the value of b2 - 4ac for the following equation?

2x^2 + 3x = -1

a) 0
b) 1
c) 17

Answer 1

2x^2 +3x = -1
2x^2 +3x +1 = 0

b=3; a=2; and c=1; (3)^2-4(2)(1) = 9-8 = 1

Answer 2

2x^2 + 3x + 1 = 0
delta = b^2 - 4ac
= 9 - 8 = 1
x1 = 3+1/2 = 2
x2 = 3-1/2 = 1
S={1,2}

am i not right ?!

Answer 3

It looks lilke it could be factored:

(2x+1) (x+1)=0 Now for that to equal zero, then one or both of the factors must erqual zero.
or (2x+1)=0 then x=-1/2
or (x+1)=0 then x=-1
those are the two roots of your equation.

Answer 4

Please excuse the typos

Answer 5

that looks a good solutions :)