Question

x elevado a 2  -5x+6=0

Answer 1

$x^2-5x+6\\\frac{-b}{a}=x'+x"\\5=x'+x"\\\frac{c}{a}=x'x"\\6=x'x"\\x'=3\\x"=2$

Answer 2

x² - 5x +6 = 0
Δ = b² - 4.a.c
Δ= (-5)² -4.1.6
Δ= 25 - 24
Δ= 1
x = -b +- √Δ /2a
x = -(-5) +- √1 / 2.1
x = 5 +- 1/ 2
x' = 6/2 ⇒ x' = 3
x" = 4/2⇒ x" = 2
S = { 2 ; 3}