When x is zero, A is greater than both B and C

For what other values of x is A the greatest?

For what values of x is B the greatest ?

For what values of x is C the greatest?

Is there a value of x when neither A nor B nor C is greater than the other two?

You may like to find the answers either algebraically or graphically.
See Notes for Teachers and more on http://nrich.maths.org/5966

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