Question

calcule o valor numérico do polinômio p(x)=5x²-6x-8para cada valor de x:
a)x=2
b)x= -1
c)x=0
d)x=3

Answer 1

$p(x)=5 x^{2} -6x-8$

a) x=2

$p(2)=5 .2^{2} -6.2-8=5.4-12-8=20-20=0$

b) x= -1

$p(-1)=5 .(-1)^{2} -6.(-1)-8=5.1+6-8=5-2=3$

c) x=0

$p(0)=5 .0^{2} -6.0-8=5.0-0-8=0-8=-8$

d) x=3

$p(3)=5 .3^{2} -6.3-8=5.9-18-8=45-26=19$

Answer 2

Resposta:

Olá!!!

P(x)=5x²-6x-8

a)  x=2

P(2)=5.2²-6.2-8

P(2)=5.4-12-8

P(2)=20-20

P(2)=0

b)x= -1

P(-1)=5.(-1²)-6.-1-8

P(-1)= +5+6-8

P(-1)=+3

P(0)=5.0²-6.0-8

P(0)= 0-0-8=-8

P(0)=-8

d)x=3

P(3)=5.3²-6.3-8

P(3)= 5 .9-18-8

P(3)=45-26

P(3)=19

Bons estudos!!!