Question

What are the approximate solutions of 2x2 + 9x = 8 to the nearest hundredth?
A.x ≈ 1.22 and x ≈ 3.28
B.x ≈ -0.76 and x ≈ 5.26
C.x ≈ -1.22 and x ≈ -3.28
D.x ≈ -5.26 and x ≈ 0.76

Answer 1

@Haleybob Do you know the quadratic formula?

Answer 2

Nope

Answer 3

A standard quadratic equation is of the form
\[ax^2+bx+c=0\]
The solution to this equation is given by the quadratic formula
\[x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}\]
We'll get two values of x, one using the + and the other using the -
Do you understand this?

Answer 4

.x ≈ -5.26 and x ≈ 0.76??

Answer 5

@Haleybob How did you get this?