Question

obtenha os zeros da função

a) x^2 + 1

b) -2x^2 + 7x - 3

c) -x^2 +4x - 5

Answer 1

a) x2+1
delta= 0 - 4×1×1
delta= 4
-0 +-2/2
x' e x"= 2/2= 1

b) -2x2 + 7x -3
delta= 7^2 - 4×(-2)×(-3)
delta= 49 -24
delta= 25
-7+-5/-4
x'= -7+5/-4
x'= -2/-4
x'= -0,5
x"= -7-5/-4
x"= -12/-4
x"= -3

c) -x2 + 4x - 5
delta= 4^2 - 4×(-1)×5
delta= 16 + 20
delta= 36
-4+-6/-2
x'= -4+6/-2
x'= 1
x"= -4-6/-2
x"= -10/-2
x"= -5