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Solved example of binomial conjugates

The sum of two terms multiplied by their difference is equal to the square of the first term minus the square of the second term. In other words: $(a+b)(a-b)=a^2-b^2$, where:

• The first term ($a$) is $2$.
• The second term ($b$) is $\sqrt{y}$.

Calculate the power $2^2$

Cancel exponents $\frac{1}{2}$ and $2$