Question

Dada a expressão algébrica 2x²-12x-8, determine o valor numérico quando: x = 2 x= 1 x = 0.

Answer 1

a)    x = 2

$2.2^2-12.2-8=8-24-8=-24$

b)    x = 1

$2.1^2-12.1-8=2-12-8=-18$

c)    x = 0

$2.0^2-12.0-8=0-0-8=-8$

Answer 2

x = 2
2(2)² - 12(2) - 8 => 2(4) - 24 - 8 => 8 - 24 - 8 = -24
x = 1
2(1)² - 12(1) - 8 => 2(1) - 12 - 8 => 2 - 12 - 8 = -18
x = 0
2(0)² - 12(0) - 8 = -8