Question

Calcule F (X)= (x-3).(x+2)

Answer 1

x = x² +2x -3x -6
x = x² - x - 6

∆ = b² - 4ac
∆ = (-1)² - 4•1•(-6)
∆ = 1 + 24
∆ = 25

x = -b ± √∆ ÷ 2
x = - (-1) ± √25 ÷ 2
x = 1 ± 5 ÷ 2
x1 = 1 + 5 ÷ 2 = 6 ÷ 2 = 3
x2 = 1 - 5 ÷ 2 = -4 ÷ 2 = -2