Question

Solve the inequality. Suggestion: A calculator may be useful for approximating key numbers.

x2 + x − 20 < 0


(−, −5) ∪ (4, )

(−, −5)

(−5, 4) ∪ (4, )

(4, )

(−5, 4)
The missing spaces = infinty signs.. Help me pleaseeeee

Answer 1

first factor x^2 + x - 20

(x - 4) (x + 5)

and the graph concaves up, that means it has a minimum since 'a' is greater than 0

(−5, 4) is the answer

Answer 2

Thank you so much, LIFESAVER :D

Answer 3

np