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# $a \cdot a=a^2$
A number or expression multiplied by itself can be written as a square, that is a power with the exponent $2.$ \begin{aligned} 3\cdot 3 &= 3^2\\ x \cdot x &= x^2 \\ (a+b)(a+b) &= (a+b)^2 \end{aligned}