appleibeats
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- 2016
Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread
12a)
Give the two functions f(x) = (x + 1)(x - 1)(x - 3) and g(x) = (x - 1)(x + 1), for what value of x is f(x) > g(x)?
b) sketch a graph of the two funcitons on the same number plane and find the magnitude of the area between them.
I can do a) and have sketch part b)..
I found the area of the left hand region to be 13/2 units^2
and the region to the right to be 63/4 units^2
Adding these together I get 89/4 = 22 1/4 units^2
Which is wrong apparently as the answer says 21 1/12 uints^2
Not sure what I have done wrong??
12a)
Give the two functions f(x) = (x + 1)(x - 1)(x - 3) and g(x) = (x - 1)(x + 1), for what value of x is f(x) > g(x)?
b) sketch a graph of the two funcitons on the same number plane and find the magnitude of the area between them.
I can do a) and have sketch part b)..
I found the area of the left hand region to be 13/2 units^2
and the region to the right to be 63/4 units^2
Adding these together I get 89/4 = 22 1/4 units^2
Which is wrong apparently as the answer says 21 1/12 uints^2
Not sure what I have done wrong??