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secondary 3 | A Maths
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Need help please
Date Posted: 4 years ago
Views: 218
Do long division first use denominator divide by numerator.
for this question, numerator degree is lesser than denominator degree.
… long division is required only when numerator degree is higher, or equal, to denominator degree.
… long division is required only when numerator degree is higher, or equal, to denominator degree.
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numerator degree is lesser than denominator degree,
therefore long division not required.
… factorise denominator, then decompose.
therefore long division not required.
… factorise denominator, then decompose.
Date Posted:
4 years ago
since decomposed partial fractions must be equal to original expression for all values of x, we can substitute some value of x into both sides as a form of quick-check.
by substituting x=0, we get (-6/5) on both sides, therefore our answer is quite likely to be correct.
note that …
… if both side give same results,
answer is QUITE LIKELY to be correct.
… if both side give different results,
answer FOR SURE is incorrect.
to overcome the possibility that sometimes, by coincidence, both sides may give same result even when answer is incorrect, we can check by substituting with several different values of x.
by substituting x=0, we get (-6/5) on both sides, therefore our answer is quite likely to be correct.
note that …
… if both side give same results,
answer is QUITE LIKELY to be correct.
… if both side give different results,
answer FOR SURE is incorrect.
to overcome the possibility that sometimes, by coincidence, both sides may give same result even when answer is incorrect, we can check by substituting with several different values of x.
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