Question

Evaluate the expression –3x + 1.5 + 2.5x – 4.5+ 8x
when x = 2.

Answer 1

12

Explanation:

-3(2)+1.5+2.5(2)-4.5+8(2)

-6+1.5+5-4.5+16

-6+6.5-4.5+16

-6+6.5+11.5

-6+18

12

Answer 2

12

Explanation:

Step 1: plug 2 into x

–3(2) + 1.5 + 2.5(2) – 4.5 + 8(2)

Step 2: simplify

-6 + 1.5 + 5 - 4.5 + 16

Step 3: add all the numbers

-6 + 1.5 + 5 - 4.5 + 16 = 12