# Core 1 Notes Edexcel

Notes for Core 1 Edexcel maths. I made these for my resit having, and having done C2 and C3 i didnt bother with differentiation/integration notes, but the rest of the spec is there.

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- Created by: tom
- Created on: 08-06-11 16:17

First 160 words of the document:

Algebra and Functions

Indices

Indices are numbers that are raised to a power (eg. 251/2). The laws of indices are as follows:

ya × yb = ya+b

ya ÷ yb= ya-b

y -b = 1/yb

ym/n = (ny)m

(yn)m = ynm

y0 = 1

Surds

Surds are numbers left in root form to give exact answers when they equal numbers with

lots of decimal places (eg. 23 ). Rationalising Surds is a way of modifying surd expressions

so that the square root is in the numerator of a fraction and not in the denominator.

The method is to multiply the top and bottom of the fraction by the square root. If there is

an expression such as 1 + 2 in the denominator, you can use the difference of two squares

to rationalise it. In this case is would be achieved by multiplying the top and bottom of the

fraction by 1 - 2

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