SOLUTION: please help. Find all real solutions to each equation. 1. a^2-40=0 2. w^2+49=0

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: please help. Find all real solutions to each equation. 1. a^2-40=0 2. w^2+49=0      Log On


   

Question 179160: please help.
Find all real solutions to each equation.
1. a^2-40=0
2. w^2+49=0
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
1)a^2-40=0
2. w^2+49=0
:
a%5E2-40=0
:
a%5E2=40
:
sqrt%28a%5E2%29=sqrt%2840%29---->sqrt%2840%29=sqrt%284%2A10%29=2sqrt%2810%29
:
system%28a=2sqrt%2810%29%2Ca=-2sqrt%2810%29%29
:
a%5E2%2B49=0
:
a%5E2=-49
:
sqrt%28a%5E2%29=sqrt%28-49%29
:
system%28a=7i%2Ca=-7i%29