SAT Math Practice Question
If $a^{2}+b^{2}=z$ and $a b=y$, which of the following is equivalent to $4 z+8 y$ ?
- A.$(a+2 b)^{2}$
- B.$(2 a+2 b)^{2}$
- C.$(4 a+4 b)^{2}$
- D.$(4 a+8 b)^{2}$
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