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Maths C1

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MATHS AS LEVEL CORE 1

ALGEBRA AND FUNCTIONS

Indices Laws

* am x an = am+n * am ÷ an = am-n * (am)n = amn * a1/n = (for the nth root of x) * am/n = (a1/n)m or ()m * a-m = 1/am * a0 = 1

Surds

ab= a x b

a/b= a ÷ b

Rationalising Fraction Denominators

1a multiply top and bottom by a

1a+b multiply top and bottom by a - b

1a-b multiply top and bottom by a + b

QUADRATIC FUNCTIONS

Drawing Graphs of Quadratic Equations

1. Draw table of values for values asked for 2. Plot points and join them in a parabola * (a > 0 there will be minimum) * (a < 0 there will be maximum)

Solving Quadratic Equations

1. Factorising 2. Quadratic Formula 3. Complete the Square

Quadratic Factorising for Coefficient Greater than One

1. Multiply a and c 2. Look for two numbers that multiply to make ac and add to make b 3. Split the equation in half and use the common bracket to solve

EXAMPLE:
6x2 – 11x – 10
Multiply to make -60
Add to make -11
So -15 and 4

6x2 – 15x + 4x – 10
3x(2x-5) + 2(2x-5)
(3x + 2) (2x – 5) x = -2/3 x = 5/2

Quadratic Formula

x=-b±b2-4ac2a

Completing the Square

x2 – 10x = 5
(x – 5)2 – 25 = 5
(x – 5)2 = 30 x – 5 = x = + 5
The Discriminant

Typical Quadratic: ax2 + bx + c = 0
Discriminant: b2 – 4ac

If b2 – 4ac is a square number then the quadratic will factorise.

The Discriminant and Roots

Situation | Meaning | Graph | b2 > 4ac | Two distinct roots | Crosses x-axis twice | b2 = 4ac | Two equal roots | Touches x-axis once | b2 < 4ac | No real roots | Does not touch x-axis |

EQUATIONS AND INEQUALITIES

Solving Inequalities

1. Elimination 2. Substitution 3. Using methods used to solve linear equations

WHEN MULTIPLYING AN INEQUALITY BY A NEGATIVE NUMBER, TURN AROUND

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