Question

calcule o valor da função f (x) = x² -5x +2 , para a) x=-4 b) x=-1 c) x=3/2 d) x=√2

Answer 1

f(x) = x^2 - 5x +2

a= 1
b= -5
c= 2

∆= b^2 - 4ac
∆= (-5)^2 - 4 . 1 . 2
∆= 25 - 8 ∆= 17

x' = -b ± √∆ = -(-5) ± √27
2.a. 2.1

= 5+/-
2

x' = 5+2 = 7
2

x" = 5-2 = 3
2