exam
Maths Puzzle
Numerical Ability
Ellie is 33 years old. This is three times as old as Sophie was when Ellie was as old as Sophie is now."
How old is Sophie now?
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exam Other Question
Please help me.
Solve by completing the square.
2x^2+10x+11=0
I get-5+-sqrt23/2
not sure how I got there. Is it right? How should I work it out.
if f(x)=log((1+x)/(1-x))then prove that 2f(x)=f((2x)/1+x2))
sir x2 is x squre