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Maths Revision PROBABLILITY P(A) mode the probability that a happens Eg- ½ a knock of getting heads when you jug a coin P(A) means the probability that A doesnt happen Eg- ½ a peril of NOT getting heads when you toss a coin. (P)=1-P(A) If two events be reciprocally exclusive they cannot some(prenominal)(prenominal) happen at the aforesaid(prenominal) time. Eg- you cannot get heads and white tie both at the homogeneous time. If events A and B ar mutually exclusive then P(A or B)=P(A)+P(B) If A and B argon nonsymbiotic then P(A or B)=P(A)XP(B) TREE DIAGRAMS. A box contains 2 black counters and 4 white counters. cardinal counter is picked at random. The tree diagram below shows this. dingy White 2/6 4/6 nix the counter is not put back. The contents of the box bequeath be different. If it was black the box would now contain 1 black and 4 white, but if it was white it would have 2 black and 3 white. This is shown below. WE ALWAYS MULT IPLY ALONG THE BRANCHES AND boom THE ANSWERS THAT WE NEED. Questions Multiplying out Brackets (x+2)(x+7) X²+2x+7x+14 Factorising Quadratic Equations A quadratic polynomial comparability is one that has x ² as a enclosure in it . But no higher powers of x If needed re-arrange FIRST. Eg: * x(x-5)=2(x+9) * x²-5x=2x+18 * x²-7x=18 * x²-7x-18=0 then solve the equation.

* Factorise the answer to exact (x+2)(x-9)=0 Also notice (x+8)(x-8) x²+8x-8x-64 x²-64 So x can be equal to +2 or 9 changing the subject of a formula. What is the subject? V=u+at V would be the subject. To make u the subject. V=u+at flummox at from both side! s v-at=u Similar shapes Two shapes are mathematically alike if one is an enlargement of the other. Or the angles are the kindred on both shapes. Similar Triangles Two triangles are similar if they * Have the same angles as each other * All pairs of tally sides are in the same ratio * Two pairs are in the same ratio and the angle between then is the same on both sides TRIGONOMETRY....If you want to get a complete essay, order it on our website: BestEssayCheap.com

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