Question

Dwa zadania w zalączniku

Answer 1

1) f(x) = (x+3)² - 1 = x² + 6x + 9 - 1 = x² + 6x + 8
Δ = 6² - 4 · 1 · 8 = 36 - 32 = 4  √Δ = 2
x1 = (-6 + 2) / 2 = -4 / 2 = -2
x2 = (-6 - 2) / 2 = -8 / 2 = -4

Odp.: C. (-∞; -1>

2) y = x² + 4x
p = -4/2 = -2
q = f(p) = f(-2) = (-2)² + 4 · (-2) = 4 - 8 = -4

Odp.: B. y = 2x