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 Author: Dollop7995 ID: 204923 Filename: Quadratics Updated: 2013-03-04 15:50:09 Tags: C1 OCR Maths Folders: Description: Polynomials, quadratic formula, complete the square.... Show Answers:

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1. Factorising
• find common factors
• find 2 numbers which multiply to give c and add to give b

2. Splitting the Middle term!

(a,b,c are integers)
• 1. find ac
• 2. find 2 numbers (p&q)
•       pq=ac
•       p+q=b
• 3. use p&q to split middle term
• arrange into bracket by taking out common factor! (same bracket =1st bracket outside numbers =2nd bracket)
3. Solving equations by factorisation!
• factorise the question into brackets
• p and q equal the roots of the graph
• if both brackets are the same the graph only touches its root.
4. Complete the square
• 1. Halve the middle term
• 2. put this in a bracket with x and square the bracket
• 3. compare expanded form with what is required and adjust
5. Solving linear inequalities
solve the same way as an equation!

if you divide or multiply by a negative flip the sign!

you cant square or root both sides of an inequality!

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