Answer:
P = 6x - 8
Explanation:
the perimeter (P) of a rectangle is calculated as
P = 2( length + width)
here length = x - 4 and width = 2x , then
P = 2(x - 4) + 2(2x) ← distribute parenthesis
= 2x - 8 + 4x ← collect like terms
= 6x - 8
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