Question

Qual o valor numérico da 6x² – 8x, para x = 2?

a) 8

b) 10

c) 15

d) 21​

Answer 1

Bom Dia !!!

$Apenas\ trocamos\ x\ por\ 2:\\\\6x^2 - 8x\\\\6.(2)^2 - 8.2\\\\6.4 - 16\\\\24 - 16$$\\{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\boxed{\sf Resultado = 8 }}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}$

Espero ter ajudado :-)

Att: LDC

Answer 2

Resposta:

a) 8

Explicação passo-a-passo:

Substitua a variável x com 2 na expressão.

6(2)² − 8 • 2

Simplifique cada termo.

24−16

Subtraia 16 de 24.

8