formulas/rules for quadratics

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igcse maths edexcel

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5 Terms

1
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quadratic formula

x = -b ± √b2 - (4ac) /2a

2
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binomial square formula

(a + b)2 = a2 + 2ab + b2

3
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completing the square

x2 + bx = (x + bx/2x)2 - (bx/2x)2

4
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discriminant rules quadratic formula

if b2 - 4ac > 0, there are 2 real solutions, if it = 0 there is 1 real solution, if it is <0 there are no real solutions

5
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What do you do when multiplying or dividing by a negative in inequalities?

FLIP THE SIGN