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x2+4x-21= 0, This can be factorised into brackets as shown: (x+2)2 - 4 - 21 = 0 SImplified, so all x's are on one side of the equation: (x+2)2 = 25, Removing square root,...
As the tangent meets the circle at P, when x =1, we can assume that the y value will be the same for this value of x. therefore we substitute x=1 into the equation of the cirlce. Rearranging the equation ...
i) (5 x 4) -12 = 8 ii) 5(x + 1) - 12 5x + 5 -12 5x - 7
dy/dx= (2 * 8)x(2-1) +4 = 16x + 4
The answer is -3x + 2 + 9/(2x-3). That is A = -3, B = 2 and C = 9.
I will use the whiteboard during my interview to explain the working.
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