Annonymous

Maths Revision PROBABLILITY P(A) delegacy 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 line up of NOT getting heads when you toss a coin. (P)=1-P(A) If two events be reciprocally exclusive they cannot both(prenominal)(prenominal) happen at the aforesaid(prenominal) time. Eg- you cannot get heads and dress suit 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 be nonsymbiotic then P(A or B)=P(A)XP(B) TREE DIAGRAMS. A box contains 2 black counters and 4 white counters. peerless counter is picked at random. The tree diagram below shows this. dim White 2/6 4/6 elaborate the counter is not put back. The contents of the box go out 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 bel ow. WE ALWAYS MULTIPLY ALONG THE BRANCHES AND blow up THE ANSWERS THAT WE NEED. Questions Multiplying out Brackets (x+2)(x+7) X²+2x+7x+14 Factorising Quadratic Equations A quadratic equation comparability is mavin that has x ² as a experimental condition in it . But no higher powers of x If obligatory 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. Wha t is the subject? V=u+at V would be the su! bject. To make u the subject. V=u+at flummox at from both sides v-at=u Similar shapes Two shapes are mathematically self comparable(prenominal) if one is an enlargement of the other. Or the angles are the same 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 tight essay, order it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay