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Quadratics a level maths help!
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#2
(Original post by Yoora3)
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pls do these two questions for me. Do it on paper n take a photo of the solutions and send them to me. Very urgent!
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I did try. But i don't have the answers. And am weak in quadratics. For the first question i don't know how to sketch. For the second one, i don't understand part (ii)
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#6
(Original post by Yoora3)
I did try. But i don't have the answers. And am weak in quadratics. For the first question i don't know how to sketch. For the second one, i don't understand part (ii)
I did try. But i don't have the answers. And am weak in quadratics. For the first question i don't know how to sketch. For the second one, i don't understand part (ii)
The domain of f^(-1)(x) is the range of f(x). f(x) is a quadratic and has a minimum point, see if you can work out the range of that.
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#7
(Original post by Yoora3)
I did try. But i don't have the answers. And am weak in quadratics. For the first question i don't know how to sketch. For the second one, i don't understand part (ii)
I did try. But i don't have the answers. And am weak in quadratics. For the first question i don't know how to sketch. For the second one, i don't understand part (ii)
for 2ii) it'd be a good start to find the range of
. You should know the relationship between and 
geometrically -which will help you find the domain of the inverse function.
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(Original post by Zacken)
If you want us to check your answers, then put your answer up and we'll check it. You don't need to sketch for the first part, you're just meant to interpret geometrically the solutions to those two curves. hint: think about intersections.
The domain of f^(-1)(x) is the range of f(x). f(x) is a quadratic and has a minimum point, see if you can work out the range of that.
If you want us to check your answers, then put your answer up and we'll check it. You don't need to sketch for the first part, you're just meant to interpret geometrically the solutions to those two curves. hint: think about intersections.
The domain of f^(-1)(x) is the range of f(x). f(x) is a quadratic and has a minimum point, see if you can work out the range of that.
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#10
The completing the square bit looks good, well done!
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#11
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(Original post by Zacken)
All you have to do for (i) is just show that the discriminant of the quadratic you are left with is smaller than 0.
The completing the square bit looks good, well done!
All you have to do for (i) is just show that the discriminant of the quadratic you are left with is smaller than 0.
The completing the square bit looks good, well done!
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Is the sketch good for question 1?? The solution is (3,2) - - - the answer i got.
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#14
(Original post by Yoora3)
How about the sketch??
How about the sketch??
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