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16 Cards in this Set
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 Back
b^2  4ac is called what?

The discriminant


b^2 = 4ac equals how many roots?

1 root


b^2 > 4ac equals how many roots?

2 roots


b^2 < 4ac equals how many roots?

No real root?


If b^2  4ac is square, the quadratic does what?

Factorises


If you are solving a quadratic inequality and the end is < 0, how many parts are there?

One


If you are solving a quadratic inequality and the end is > 0, how many parts are there?

Two


In a quadratic inequality, how can you tell if it's one or two parts?

< 0 is one part, < 0 is a small number, smaller than > 0 so the smallest one is one part.


What is the addition rule?

P(AuB) = P(A) + P(B)  P(AnB)


What does P(ab) mean?

The  means 'given that' or 'on the condition that'...'b' has already happened


What is the multiplication rule?

P(AB) = P(AnB)/P(B)


What does 4.2 mean?

4 x 2 = 8. the dot means times.


How do you work out the equation of a line?

(yy1)/y2y1) = (xx1)/(x2x1)


M = ?

(yy1)/(xx1)


For independent events, P(AnB) = ?

P(A) x P(B)


For mutually exclusive events P(AnB) = ?
Think about it! 
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