Solve this
My cousin-in-law, Jek Kin has started a new blog on Mathematics. He was formerly a maths teacher in a secondary school in Sungai Petani.
Thought of posting an interesting math question I've seen many years ago. The solution is quite easy, but only if you can figure out how to start.
Feel free to attempt and post your solutions (or describe it) here.
Good luck!
3 comments:
Let the answer be x.
sqrt(12+x) = x
x^2 -x-12 =0
(x+4)(x-3)=0
Since x can't be -ve, x=3
Not sure whether that's the solution. Just guessing :)
The method is correct but the answer is 4. I think you've made a careless mistake in the final step. It should be (x-4)(x+3) = 0. Well done!
oya hor.so careless...hahaha :p
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