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$a \t a=a^2$

Theory

aa=a2a \cdot a=a^2

A number or expression multiplied by itself can be written as a square, that is a power with the exponent 2.2. 33=32xx=x2(a+b)(a+b)=(a+b)2\begin{aligned} 3\cdot 3 &= 3^2\\ x \cdot x &= x^2 \\ (a+b)(a+b) &= (a+b)^2 \end{aligned}