Step-by-step explanation:
I think it's D 1 1/2
x² + 3x + 7 = 0 [ax² + bx + c]
a = 1
b = 3
c = 7
quadratic formula:
(+/- is this ±)
plug in the numbers into the variables
your answer is a
cross multiplying, we get :
⇒ (3) × (5) = (9) × (x)
⇒ 15 = 9x