Question

determine an algebraic expression for the perimeter of the following triangle. perimeter = sum of all exterior sides (2x + 1) (x + 4) (1 - x) 2x + 6 2x + 5 3x + 6 4x + 5

Explanation:

Step1: Write perimeter formula

Perimeter $P=(2x + 1)+(x + 4)+(1 - x)$

Step2: Remove parentheses

$P=2x + 1+x + 4+1 - x$

Step3: Combine like - terms

$P=(2x+x - x)+(1 + 4+1)$
$P=2x+6$

Answer:

A. $2x + 6$