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Post by iiPod on May 31, 2009 1:33:45 GMT -5
Thanks jimmythenumbers
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Post by Jimmythenumbers on May 31, 2009 10:04:17 GMT -5
Fair point. In most examples, there are two solutions though. I've edited the advice to say that they usually have two. I should probably restrict myself to being constructive, rather than picking holes in good answers in the future. Ah well.
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lbb
Year 1
My site ! Logo Designed By the 1 and only iiPod, which has been mercilessly squished by me!
Posts: 55
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Post by lbb on May 31, 2009 10:19:11 GMT -5
Uhh Just practise and make poems to memorise your revision !
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Post by Jason on Jun 1, 2009 4:45:39 GMT -5
Basically, a quadratic trinomial comes in the form of ax 2 + bx + c = 0 and usually have two different possible solutions for x. They can be solved in two ways and I will explain both of these now. Factorisingx 2 - 7x + 6 = 0 In order to solve x, you must first take c, which is +6. Then see what two numbers can be multiplied together to make +6. These could be either 1&6 or 2&3. Then pick the combination that can be added together to make b, which is -7. Once you have these terms, you can place them into a double bracket that, when multiplied out, will give the above equation. (x - 1)(x - 6) = 0 I will now multiply these out to see whether it gives the correct equation. x times x = x 2x times -6 = -6x -1 times x = -1x -1 times -6 = +6 This gives the equation: x 2 - 7x + 6 = 0 Therefore, we have factorised correctly. Now we just need to finish solving the equation. In order for the double bracketed equation to equal 0, one of the brackets must be 0. Therefore, either: x - 1 = 0 so x = 1 or x - 6 = 0 so x = 6 So, the two possible solutions for x are 1 and 6.FormulaThe other way of doing it is to use the quadratic formula, which is: Good post, I actually knew this surprisingly enough, but I didn't know what trinomials were, only what quadratics are.
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Post by TomBeasley on Jun 1, 2009 8:33:11 GMT -5
Did a Maths exam today and there was a question on quadratics in it. It had a bit more to it than simply factorising the equations though and I don't think I managed that extra bit. Good thing I know what I'm doing.
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lbb
Year 1
My site ! Logo Designed By the 1 and only iiPod, which has been mercilessly squished by me!
Posts: 55
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Post by lbb on Jun 1, 2009 9:15:33 GMT -5
End of year exams !
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Post by Jimmythenumbers on Jun 7, 2009 16:32:45 GMT -5
Did a Maths exam today and there was a question on quadratics in it. It had a bit more to it than simply factorising the equations though and I don't think I managed that extra bit. Good thing I know what I'm doing. Can has question?
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Post by TomBeasley on Jun 7, 2009 16:34:21 GMT -5
Did a Maths exam today and there was a question on quadratics in it. It had a bit more to it than simply factorising the equations though and I don't think I managed that extra bit. Good thing I know what I'm doing. Can has question? I can't remember it now.
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