Question

o valor de :
(X+2)×(x-3)

Answer 1

${x}^{2} - 3x + 2x - 6$
${x}^{2} - x - 6$

Answer 2

x² - 3x + 2x - 6

x² - x  - 6 = 0         a = 1     b = -1     c = - 6

Δ = b² - 4ac

Δ = -1² - 4.1.-6

Δ = 1 + 24

Δ = 25

x = - b +-√Δ/2a

x = -(-1) +-√25/2.1

x = 1 +-5/2

x' = 1 + 5/2 = 6/2

x' = 3

x" = 1 - 5/2 = -4/2

x" = - 2