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3 years ago

Factor k2 - 81. I would love it if someone could help me

2 answers:

german3 years ago

5 0

1. Rewrite it in the form a^2-b^2, where a=k and b=9
k^2-9^2

2. Use difference of squares: a^2-b^2 = (a+b)(a-b)
(k+9)(k-9)

ZanzabumX [31]3 years ago

4 0

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3 years ago

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How many ways can 4 candy bars be chosen from a store that sells 30 candy bars (combination)

Morgarella [4.7K]

Answer:

Using the combination formula:

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$\frac{n!}{r! \cdot (n-r)!}$

As per the statement:

4 candy bars be chosen from a store that sells 30 candy bars

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then substitute in the given formula we have;

$\frac{30!}{4! \cdot (30-4)!}$

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Simplify:

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3 years ago

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