Question

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

Answer 1

too do this problem do i put the 5 and -5 in for x or what that is what i am having problems with?

Answer 2

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

2. 2x2 + 10 = 60 2.Distrubutive law

3. 2x2 = 50 3. Equals subtracted from equal, remainders are equal.

4. x2 = 25 4. Equals divided by equals quotients are equal.

5. x = ±5 5. Square roots of equals are equal.

Answer: x = ±5

Answer 3

thanks no i know what to do

Answer 4

Np