Year 10 Maths Higher Tier Revision
- Created by: xoxbeckywxox
- Created on: 28-04-15 20:12
Simplifying expressions
Gather all similar expressions together: Group all letters
4a+a-7d+6d= 5a-d
4a+a2-a=3a+a2 You can't add 4a and a2, so they are separate, just as you can't add a2 and a3.
Indices
a2 x a3=a5 a4 / a2=a2 (a2)3=a6
a-2 x a3=a a-4 / a2=a-6 (a-2)3=a-6
a2 x a-3=a-1 a4 / a-2=a6 (a2)-3=a-6
a-2 x a-3=a-5 a-4 / a-2=-2 (a-2)-3=a6
3 to the power of -3= 1/27 (3x3x3=27 reciprocal)
25 to the power of 1/2=5 (square root of 25)
27 to the power of 2/3= 9 (cube root of 27=3 square it)
Expanding brackets
single brackets- times the term on the outside of the bracket by the terms on the inside of the bracket. eg 3(a+2)=3a+6
Double brackets- FOIL
F irst: Multiply the first term in each bracket
O utside: Multiply the terms on the outside of the expression
I nside: Multiply the terms on the inside of the expression
L ast: Multiply the last term in each bracket
THEN SIMPLIFY EG: (3a+2)(2a+6)
F O I L
6a2 18a 4a 12
6a2+18a+4a+12= 6a2+22a+12
Factorising Brackets
Single Brackets- Look for a common factor and put it outside the brackets. Put the unique terms inside the brackets eg: 18a+12=6(3a+2)
Double Brackets- ax2+bx+c
If a=1, you can factorise using a sum and product approach.
Eg: x2+12x+35, you need…
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