Question

I need helpp plss and thanks

Answer 1

`x = 2 √(2) i \: or \: x = - 2 √(2) i`

Explanation:

• Add 7 to both sides.

`3x {}^(2) - 7 + 7 = - 31 + 7`

• Simplify

`3x {}^(2) = - 24`

• Divide both sides by 3

`\frac{3x {}^(2) }{3} = ( - 24)/(3)`

• Simplify

`x {}^(2) = - 8`

• Find the solution

`x = √( - 8) \: and \: x = - √( - 8)`

• Simplify

`√( - 8) = 2 √(2i)`

`- √( - 8) = - 2 √(2i)`

ANSWER:

`x = 2 √(2) i \: and \: x = - 2 √(2) i`

Answer 2

1.63

Explanation:

-31 + 7 = -24

`√(-24)` = 4.9

4.9/3 = 1.63 (rounded down from 1.6333333)