Which equation has the components of 0= x2 - 9x - 20 inserted into the quadratic formula correctly?

x= -91V(-9)2 - 4(1)(-20) over
2(1)
x= 9:V(- 9)? – 4(1)(20) over
2(1)
x = 9:V(- 9)2 – 4(1)(-20) over
2(1)
x= -9+7 (-9)+ 4(1)(-20) over
2(1)

answer: i'm great at algebra

~coco

step-by-step explanation:

example 2 – simplify: step 1: completely factor both the numerators and denominators of all fractions. step 2: change the division sign to a multiplication sign and flip (or reciprocate) the fraction after the division sign; essential you need to multiply by the reciprocal. step 3 : cancel or reduce the fractions.

5   1/4   miles per hour

step-by-step explanation:

15   3/4 / 3 = 5   1/4