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Maths Revision PROBABLILITY P(A) representation 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 get hold of NOT getting heads when you toss a coin. (P)=1-P(A) If two events ar reciprocally exclusive they cannot both(prenominal) happen at the aforesaid(prenominal) time. Eg- you cannot get heads and pursue both at the homogeneous time. If events A and B atomic number 18 mutually exclusive then P(A or B)=P(A)+P(B) If A and B are nonsymbiotic then P(A or B)=P(A)XP(B) TREE DIAGRAMS. A box contains 2 black counters and 4 white counters. iodin counter is picked at random. The tree diagram below shows this. somber White 2/6 4/6 vigor the counter is not put back. The contents of the box exit 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 ALWAY S MULTIPLY ALONG THE BRANCHES AND dramatise 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 single that has x ² as a endpoint in it . But no higher powers of x If requisite 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 subj! ect. V=u+at flummox at from both sides v-at=u Similar shapes Two shapes are mathematically similar if one is an enlargement of the other. Or the angles are the equal 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 sloshed essay, order it on our website: BestEssayCheap.com

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