Abrax99 wrote:
Is x>0?
1) x^2=9x
2) x^2=81
1) x^2=9x
x^2- 9x = 0
x (x - 9) = 0
x = 0 or x = 9
No certain answer
Insufficient
2) x^2=81
x =9 or x =-9
No certain answer
Insufficient
Combine 1 & 2
x = 9
Answer is always yes
Answer: C
Is x>0?
1) x^2=9x
2) x^2=81
1) x^2=9x
x^2- 9x = 0
x (x - 9) = 0
x = 0 or x = 9
No certain answer
Insufficient
2) x^2=81
x =9 or x =-9
No certain answer
Insufficient
Combine 1 & 2
x = 9
Answer is always yes
Answer: C
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