IXL - Area and perimeter of rectangles using variable expressions (Algebra 1 practice)

Find the area. Simplify your answer.

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Learn with an example

question

Find the area. Simplify your answer.

key idea

Area of a rectangle:

where

is the base and

is the height.

solution

Find the base and height of the rectangle.

base: 8
height:
x
+
7

Use these values in the area formula:

Plug in

and

(

)

(

)

Plug in

and

Multiply the base and the height, applying the distributive property

(

)

(

)

(

)

(

)

Multiply the base and the height, applying the distributive property

Simplify

The area is

Looking for more? Try these:

Lesson: Simplifying expressions

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W.6Multiply a polynomial by a monomial

Area

Perimeter

Lesson: Simplifying expressions

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