13) \(\sqrt{x^2}=\left|x\right|\)
14) \(\sqrt{x^4}=x^2\)
15) \(\sqrt{\left(3x-2\right)^2}=\left|3x-2\right|\)
16) \(\sqrt{\left(2x+1\right)^2}=\left|2x+1\right|\)
17) \(\sqrt{a^2-2a+1}=\left|a-1\right|\)
18) \(\sqrt{4a^2-4a+1}=\left|2a-1\right|\)
19) \(\sqrt{x^2+6x+9}=\left|x+3\right|\)
20) \(\sqrt{a^2-a+\dfrac{1}{4}}=\left|a-\dfrac{1}{2}\right|\)
21) \(\sqrt{4x^2-4xy+y^2}=\left|2x-y\right|\)
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