Solve the equation below. Indicate which solutions, if any, are extraneous. √ x+5 = x+3
1 answer:
9514 1404 393
Answer:
x = -1
Step-by-step explanation:
A graphical solution can avoid extraneous solutions. The attachment shows the one solution is x = -1.
__
Squaring both sides gives ...
x +5 = (x +3)² = x² +6x +9
Putting this in standard form, we have ...
x² +5x +4 = 0
(x +1)(x +4) = 0 . . . . . factor
x = -1 or -4 . . . . . . . . values of x that make the factors zero
__
Since we require the root to be non-negative, we must have ...
x +3 ≥ 0
x ≥ -3
The only solution that satisfies this requirement is x = -1. The solution x = -4 is extraneous. The solution is x = -1.
You might be interested in
There are 32,760 different orders for the first four positions.
This is a permutation where repetition is not allowed; the formula for that is:
For our problem, we have:
This is a permutation where repetition is not allowed; the formula for that is:
For our problem, we have: