EXCELLENCE. 2009 Use quadratic formula Their answer is wrong! H is not negative.

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Presentation transcript:

EXCELLENCE

2009

Use quadratic formula

Their answer is wrong! H is not negative

2009 The line y = 2x + k is a tangent to the circle x 2 + y x = 0. k is a constant. Find the possible value(s) of k.

2009 The line y = 2x + k is a tangent to the circle x 2 + y x = 0. k is a constant. Find the possible value(s) of k.

The line y = 2x + k is a tangent to the circle so

2008

Find an expression for x in terms of h x/2, h lie on the line

2007 The roots of the equation are k and k - 1. Find the value of c.

2007 The roots of the equation are k and k - 1. Find the value of c. Form the quadratic and match

2007.

2006 A chemical was used to treat the water in a swimming pool. The concentration of the chemical at 8 am was 200 mg per litre. The concentration of the chemical in the water reduces by 30% each hour. It is not safe to swim in a pool in which the concentration of the chemical is more than 25 mg per litre. The concentration C mg per litre of the chemical in the water t hours after 8 am is given by C = 200 ( 0.7) t How many hours after 8 am will it be safe to swim in the pool?