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secondary 4 | A Maths
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It will be great if you can solved qn 2(b). The answer in square root. I didn’t get the correct answer
Date Posted: 4 years ago
Views: 212
4x⁴ - 7x²y - 2y²
= 4(x²)² - 7(x²)(y) - 2y²
= (4x² + y)(x² - 2y)
let x² = a and y = b²
Then try to factorise 4a - 7ab - 2b²
= 4(x²)² - 7(x²)(y) - 2y²
= (4x² + y)(x² - 2y)
let x² = a and y = b²
Then try to factorise 4a - 7ab - 2b²
Aisya, the answer will not contain a ‘square root’.
Thanks Nicholas!
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Once you realise that the equation is quadratic-like, you will then proceed to figure out how to make the quadratic idea work.
Date Posted:
4 years ago
Thanks for the answer. It is the wrong answer given
It’s actually a correct answer. I am not sure what the question asks for. If you expand the brackets fully, you should get the answer. The given answer in your book (if any) is probably incorrect.
The x2 - 2y is not to be factorised into (x + sqrt (2y)) (x - sqrt (2y)).
The x2 - 2y is not to be factorised into (x + sqrt (2y)) (x - sqrt (2y)).
What is the given answer? I suspect it is wrong
Thanks for the help. Please don’t teach the wrong concept if you didn’t know how to answer it. Thanks
You can refer to J’s solution in the comments section for the treatment of the answers.
Eric has given the correct answer and steps. And given his track record of answers here, it is evident that he knows how to teach this concept correctly.
Very rude of you to assert that he is not knowing the right answer and teaching the wrong concepts and assuming the 'correct' answer you have is absolutely correct.
You should be checking your answer scheme with your teacher (since you say your answer is in square root it is definitely a wrong answer as there is no square root in the correct answer) instead merely dismissing the detailed workings he has provided with that kind of reply
Do you know better than him? What more when two tutors give the same consistent answer?
Do not assume that your answer scheme is always correct. You are here to learn. We spend time and effort here to craft and provide answers free of charge, we are not here to be told things like ' please don't teach the wrong concept ' by people like you , who isn't qualified enough to do so.
Please don't act like you know better when you don't even know how to answer this question correctly.
Very rude of you to assert that he is not knowing the right answer and teaching the wrong concepts and assuming the 'correct' answer you have is absolutely correct.
You should be checking your answer scheme with your teacher (since you say your answer is in square root it is definitely a wrong answer as there is no square root in the correct answer) instead merely dismissing the detailed workings he has provided with that kind of reply
Do you know better than him? What more when two tutors give the same consistent answer?
Do not assume that your answer scheme is always correct. You are here to learn. We spend time and effort here to craft and provide answers free of charge, we are not here to be told things like ' please don't teach the wrong concept ' by people like you , who isn't qualified enough to do so.
Please don't act like you know better when you don't even know how to answer this question correctly.
Both of your answers ARE wrong. I consult from someone who is lecturer and has a master degree in Maths, the answer should be (4x2+y) (x-square root 2y) (x+square root2y).
That’s definitely the correct answer.
That’s definitely the correct answer.
You still don't get it, do you? (4x² + y)(x² - 2y) is already the irreducible factorisation.
You DO NOT factorise (x² - 2y) into (x + √(2y))(x - √(2y)) at Sec 4 A Math, the topic you have stated
You DO NOT factorise (x² - 2y) into (x + √(2y))(x - √(2y)) at Sec 4 A Math, the topic you have stated
I agree with J. Aisya, though i have not looked at e qn, it's terribly rude and unfair of u to accuse Eric of being incompetent given his excellent track record ( if u had bothered to check!). Most times Eric goes the extra mile to help students understand by being very detailed in his solution. I think u owe him an apology.
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