Question

PLEASE HELP AND WILL GIVE MEDAL! THANK YOU SOOOO MUCH!!
2. Justify each step of the proof.

Conjecture: If 2(x2 + 5) = 60, then x is 5 or –5.

1. 2(x2 + 5) = 60 1.

2. 2x2 + 10 = 60 2.

3. 2x2 = 50 3.

4. x2 = 25 4.

5. x = ±5 5.

Answer 1

@ganeshie8

Answer 2

@sylbot

Answer 3

Listing off all the rules, I think, would count as sufficient justification (distribution, subtract 10, divide by 2, etc.). I am not really sure what you are looking for here :(

Answer 4

Oh okay thanks anyways.