<p>For test 1.</p>
<p>If x is a real number such that x^3 = 64, then x^2 + square root x.</p>
<p>4
10
18
20
47</p>
<p>The answer key: 18</p>
<p>To find out what x^2 + square root x equals, you need to solve x^3 = 64 for x. The solution is ^3 square root 64, which is 4. Then, subsituting into the original expression, you get 4^2 + square root 4. This expression simplifies to 16 + 2, or 18.</p>
<p>How do they get the 3^ square root 64 is 4? I don’t understand this.</p>