x + 9 = 25
x = 25 - 9
x = 16
x + 9 ≥ 0
x ≥ - 9
Answer:
A ) x = 16, solution is not extraneous.
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x + 9 = 25
x = 25 - 9
x = 16
x + 9 ≥ 0
x ≥ - 9
Answer:
A ) x = 16, solution is not extraneous.
Remember
so
notice that 200=2*2*2*5*5, so x cannot be a whole number
take the log base 10 of both sides
divide both sides by
if we used
instead of 
we would get
because 
so
notice that 200=2*2*2*5*5, so x cannot be a whole number
take the log base 10 of both sides
divide both sides by
if we used