SOLUTION: I think of a number, add 6 then multiply this answer by itself. My answer is 64. What number did I start with?

SOLUTION: I think of a number, add 6 then multiply this answer by itself. My answer is 64. What number did I start with?

Algebra.Com

Question 847602:
I think of a number, add 6 then multiply this answer by itself. My answer is 64. What number did I start with?
Answer by checkley79(3341) (Show Source): You can put this solution on YOUR website!
(X+6)^2=64
X^2+12X+36=64
X^2+12X+36-64=0
X^2+12X-28=0
(X+14)(X-2)=0
X+14=0
X=-14 ANS
X-2=0
X=2 ANS
PROOF:
(-14+6)^2=64
-8^2=64
64=64
(2+6)^2=64
8^2=64
64=64
RELATED QUESTIONS
I think of a number multiply it by 3 and then add 21 my answer is... (answered by Edwin McCravy)

I think if a number, then multiply it by 6 and the answer is 132. What was my... (answered by ikleyn)

6.I am thinking of a whole number. If I divide it by 13, then multiply the answer by 12, (answered by Fombitz)

I think of a number. I double it. I divide the result by 5. My answer is 6. What number... (answered by Fombitz)

I think of a number. I subtract 12, halve it, and add 33 and divide it by 9. My answer is (answered by Simnepi)

I am thinking of a whole number. If I divide it by 13, then multiply the answer by 12,... (answered by ankor@dixie-net.com)

i am thinking of a whole number. if i divide it by 13, then multiply the answer by 12,... (answered by stanbon)

Think of a number multiply it by 3 then add 3 I get 12 what is the number (answered by staceyd88)

i think of a number i add 3 to it then treble the total my final answer is 36 what is my... (answered by macston)