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| Give two reasons for using surds... |
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Definition
- You don't need a calculator
- They are more accurate as you don't have to round off.
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| What is the rule for multiplying surds? |
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| What is the rule for dividing surds? |
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| Numbers in surds must be as small as possible. Break √48 into its factors. |
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Definition
= √48
= √16x3
= √16 x √3
= 4 x √3
= 4√3 |
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Term
| When splitting a surd into its factors, what must you do? |
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Definition
| Find the highest square number |
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Term
Use FOIL to expand this expression:
(√3 - 2)(√3 + 4) |
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Definition
F: √3 x √3 = √9
O: √3 x 4 = 4√3
I: √3 x -2 = -2√3
L: -2 x 4 = -8
FOIL: = √9 + 4√3 + -2√3 - 8
= 3 + 2√3 - 8
= -5 + 2√3
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