Question

Calcule (x+2)²





B) (3×+4)²

Answer 1

a) (x+2) X (x+2)

x²+2x + 2x + 4

x² +4x + 4 = 0

∆ = 4.1.4

∆ = 16

x = -4 √16 / 2.1

x = -4 +-4 / 2

x' = -4+4/2 = 0

x" = -4-4/2 = -4

b) (3x+4) X (3x+4)

9x² + 12x + 12x + 16

9x² + 24x + 16

∆ = 4.9.16

∆ = 576

x = -24 √576 / 18

x = -24 -+24 / 18

x' = -24+24/ 28 = 0

x = 24 + 24 / 18 = 2,66

espero ter te ajudado :)