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fiasKO [112]
3 years ago
8

Use distributive law to factor the given expression: 3+21a+15b

Mathematics
1 answer:
Reil [10]3 years ago
6 0

Answer:

3(1+7a+5b)

Step-by-step explanation:

The distributive law states that

a\cdot (b+c)=a\cdot b+a\cdot c.

The expression 3+21a+15b consists of three terms:

  1. 3=3·1;
  2. 21a=3·7a;
  3. 15b=3·5b.

You can see that 3 is the common factor of these three terms, thus

3+21a+15b=3(1+7a+5b).

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<em><u>Solution:</u></em>

From 1980 to 1990, Lior’s weight increased by 25%

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<em><u>To find: weight in 1980</u></em>

This is a percentage increase problem

Let "x" be the weight in kilograms in 1980

<em><u>The percentage increase is given by formula:</u></em>

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Initial value in 1980 = x

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