Question

What are the solutions of 5x2 + 2x – 8 = 0?

Answer 1

state clearly

Answer 2

you need to use the quadric equation to solve

Answer 3

quadratic formula *

Answer 4

5x^2+2x-8....like this?

Answer 5

yes like that. you do not have to use the quadratic formula, you can compleete the square like this

x^2 + (2/5)x-(8/5) = 0

(x+(1/5))^2 = 8/5 + (2/5)^2

(x+(1/5)^2 = 8/5+ 4/25

(x+(1/5))^2 = 44/25

x+(1/5) = +-sqrt(44)/55 = 2sqrt(11)/5

x = 2sqrt(11)/5-(1/5) or x = -2sqrt(11)/5 - (1/5)

Answer 6

ok