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# Multiplying Perfect Squares

When two similar expressions like $(x+2)(x+2)$ or $(2x-3)(2x-3),$ are multiplied, you can simplify the calculations by using the rules for perfect squares. Parenthesis are rewritten as squares with two terms: $(x+2)^2 \quad \text{eller} \quad (2x-3)^2.$ Slightly different rules are used, however, depending on if there is a plus or minus sign between the terms,

## "Positive" Perfect Squares

If there is a "plus" sign between the terms you can use the following square rule:

## "Negative" Perfect Squares

If there is a negative sign between the terms in the parenthesis you can use the following square rule: