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Expand the square of a binomial (r-q)^2

User Wenqiang
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1 Answer

4 votes

(r-q)^2=r^2-2rq+q^2

Step-by-step explanation

remember the rule to expand the square of a binomial


(a-b)^2=a^2-2ab+b^2

Step 1

apply the rule,

let

a=r

b=q

replace


\begin{gathered} (a-b)^2=a^2-2ab+b^2 \\ (r-q)^2=r^2-2rq+q^2 \end{gathered}

I hope this helps you

User AntC
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