Question

quiz 2.2 (practice) expressions and equations

1. evaluate the expression $6x - 2(x + 5)$ when

a) $x = -5$
b) $x = 0$
c) $x = 5$

Explanation:

Step1: Simplify the expression

First, expand and combine like terms:
$6x - 2(x + 5) = 6x - 2x - 10 = 4x - 10$

Step2: Evaluate for $x=-5$

Substitute $x=-5$ into $4x-10$:
$4(-5) - 10 = -20 - 10 = -30$

Step3: Evaluate for $x=0$

Substitute $x=0$ into $4x-10$:
$4(0) - 10 = 0 - 10 = -10$

Step4: Evaluate for $x=5$

Substitute $x=5$ into $4x-10$:
$4(5) - 10 = 20 - 10 = 10$

Answer:

a) $-30$
b) $-10$
c) $10$