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Degree: Mathematics (Bachelors) - St. Andrews University

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Hi!

My name is Edd and I'm a first year maths student at the University of St Andrews. I'm originally from a small town called Runcorn in the North West of England. I'm part of the cross country society of the University and I enjoy playing guitar and, of course, have a passion for maths.

Back home I tutored a boy called George once a week in GCSE maths, so I know that syllabus fairly well, but I'm definitely willing to go back and relive the joyous 2 year course that is A level mathematics.

#### Subjects offered

SubjectQualificationPrices
Maths A Level £20 /hr
Maths GCSE £18 /hr

#### Qualifications

MathsA-levelA2A*
English LanguageA-levelA2A
ChemistryA-levelA2A
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### Simplify the expression: 3x + 2y -7x + c + y

The important thing in this question is the letters. We want to group "like terms" together. This is what makes the expression simpler.  I go about this by drawing a different shape around each letter. i.e the x terms would have a square, the y terms a circle and the c term a triangle. The mo...

The important thing in this question is the letters. We want to group "like terms" together. This is what makes the expression simpler.

I go about this by drawing a different shape around each letter. i.e the x terms would have a square, the y terms a circle and the c term a triangle.

The most important thing to remember when doing this is that the sign (that is, the plus/minus) BEFORE the term must stay with that term. This determines whether we add or subtract this from the other "like terms".

Once we have circled them, we can take each set of like terms and deal with them seperately. For example, the x terms would come to 3x - 7x. At this point, we deal with the numbers and don't worry about the letters, i.e we perform 3-7, this will come to -4, and, putting the letter back on, we get -4x. We do this with each set of like terms, and then put them back together.

This will give us the simplified answer -4x+3y+c.

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1 year ago

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