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16 Cards in this Set
- Front
- Back
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b^2 - 4ac is called what?
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The discriminant
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b^2 = 4ac equals how many roots?
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1 root
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b^2 > 4ac equals how many roots?
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2 roots
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b^2 < 4ac equals how many roots?
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No real root?
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If b^2 - 4ac is square, the quadratic does what?
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Factorises
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If you are solving a quadratic inequality and the end is < 0, how many parts are there?
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One
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If you are solving a quadratic inequality and the end is > 0, how many parts are there?
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Two
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In a quadratic inequality, how can you tell if it's one or two parts?
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< 0 is one part, < 0 is a small number, smaller than > 0 so the smallest one is one part.
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What is the addition rule?
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P(AuB) = P(A) + P(B) - P(AnB)
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What does P(a|b) mean?
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The | means 'given that' or 'on the condition that'...'b' has already happened
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What is the multiplication rule?
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P(A|B) = P(AnB)/P(B)
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What does 4.2 mean?
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4 x 2 = 8. the dot means times.
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How do you work out the equation of a line?
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(y-y1)/y2-y1) = (x-x1)/(x2-x1)
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M = ?
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(y-y1)/(x-x1)
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For independent events, P(AnB) = ?
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P(A) x P(B)
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For mutually exclusive events P(AnB) = ?
Think about it! |
0
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