Question on: JSS2 Mathematics - Algebraic Expressions II

A rectangle's width is 𝑀 and its length is 3𝑀+4. Find the perimeter.

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The formula for the perimeterΒ 

𝑃 of a rectangle is:

𝑃=2(Length+Width)

Substitute the given values:

𝑃=2((3𝑀+4)+𝑀)

=2(3𝑀+4+𝑀)

=2(4𝑀+4)

=8𝑀+8

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