Question

2x² + 9 = - 7x how do i find an answer using the quadratic formula

Answer 1

Answer:

(-7 ± $i$√(-23)) / 4

Step-by-step explanation:

Unless you have to show your work, you don't really have to use the quadratic formula unless it is unfactorable.

2x² + 9 = -7x    (Add 7x to both sides)

2x² + 7x + 9 = 0    ( The quadratic formula is (-b ± √(b^2 - 4ac))/2a )

A = 2

B = 7

C = 9

(-7 ± √(49 - 72))/4

= (-7 ± √(-23))/4    (Which simplifies to an imaginary answer, proving that this is, indeed, unfactorable)

= (-7 ± $i$√(-23))/4