Question

Use the quadratic formula to find the solutions to the quadratic equation below. Check all that apply. 5x2-X-4 = 0 A. -4/5 B. 5/4C. 2/3 D. 1 E. -1 F.3/2​

Answer 1

A. -4/5 And D. 1

Explanation:

i just got it right

Answer 2

Hi

5x²-x-4 = 0

Δ= (-1)² - 4*5*(-4)

Δ = 1 -4*-20

Δ = 1 +80

Δ = 81

√Δ= 9

as Δ ≥ 0 , so 2 solutions exist in R

S1 is : ( 1+9) /2*5 = 10/10 = 1

s2 = (1 -9)/2*5 = -8/10 = -4*2 /2*5 = -4/5

Corrects answers are A and D