Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Maths question, C1 simplifying????

Hi
4x+8/3 divided by x^2-3x-10/4 thanks simplify it and leave in factorised form im really stuck on it thanks for showing steps in advance

OP

??? id rely appreciate steps of how to get to the answer thanks

OP

could someone please explain

username93

could someone please explain

http://www.thestudentroom.co.uk/showthread.php?t=403989

You should know from basic GCSE fractions that

\frac{3}{5}

divided by

\frac{5}{9}

is the same as

\frac{3}{5}

multiplied by

\frac{9}{5}

So your problem can be rewitten as

\frac{4x +8}{3}

X

\frac{4}{x^2 -3x -10}

Factorise the algebra and cancel things down and you should find your solution

It'd help if you factorised 4x+8 and x²-3x-10... then the division becomes much easier, since the top and bottom have a common factor.

OP

thanks but how can you times fractions like that

username93

thanks but how can you times fractions like that

times two fractions you just times the tops and times the bottoms. This is GCSE stuff and so I recommend you ask your teacher - you need to have really solid understanding of this and doing so will make the next 2 years miles easier.

Study Forum Helper

username93

thanks but how can you times fractions like that

Try to remember to say multiply rather than times. To answer questions on algebraic fractions, you need to understand the rules of adding, subtracting, multiplying and dividing fractions (particularly cross-multiplying to find a common denominator) and you need to be able to factorise linear and quadratic terms.

OP

could you explain how to cross multiply with commmon denominator on this particular question thanks

username93

could you explain how to cross multiply with commmon denominator on this particular question thanks

It is not needed for this particular question. Usually cross multiplying is used for when you have

\frac{stuff}{morestuff} = \frac{different stuff}{extrastuff}

and then you cross multiply to get rid of the fractions.

Mr M was encompassing the whole of Algebreic fractions in his post.

username93

could you explain how to cross multiply with commmon denominator on this particular question thanks

What did you get when you factorised

\frac{4x +8}{3}

X

\frac{4}{x^2 -3x -10}

?

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