Question

20 points!!! first answer gets brainliast. Don't need too much explanation thank you!​

Answer 1

Answer:

The answer to your question is below

Step-by-step explanation:

2. $\sqrt{-128}$                Just find the prime factors of 128 and simplify

   $\sqrt{-2^{7}} = \sqrt{-2^{6} 2} = 2^{3}i \sqrt{2}$

   $8i\sqrt{2}$

3.- $\sqrt{-9} + \sqrt{-16}$     Get the square roots and simplify

     3i + 4i

     7i

4.- None of the choices is equal to one, because the exponents are pair.

5.- 1/3x² + 10 = 7

    1/3x² = 7 - 10

    1/3x² = -3

         x² = -3(3)

         x² = -9

         x = ±3i