F(x) = x² + x - 20 = x² + 5x - 4x - 20 = x(x + 5) - 4(x + 5) = (x + 5)(x - 4)
f(x) = 0 ⇔ (x + 5)(x - 4) = 0 ⇔ x + 5 = 0 or x - 4 = 0 ⇒ x = -5 or x = 4
Answer: C. x = -5 and x = 4.
Answer:
160/100=1.6
Step-by-step explanation:
Answer:
cant read
Step-by-step explanation:
:P
Add the x^3:- 6 x3 + 3x3 = 9x3
x's:- -8x + 6x = - 2x
-5 + 2 = -3
the first choice is the correct one
