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Helen [10]
3 years ago
15

Which expression shows the correct multiplication of the following polynomilas? 3x(6x^2-3x+7)

Mathematics
1 answer:
snow_tiger [21]3 years ago
8 0

Answer: 18x^3-9x^2+21x

Solution:

3x(6x^2-3x+7)=

Applying the distributive property in the multiplication to eliminate the parentheses:

(3x)(6x^2)+(3x)(-3x)+(3x)(7)=

(3*6)x^(1+2)+3*(-3)x^(1+1)+(3*7)x=

18x^3-9x^2+21x

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==========================================

Work Shown:

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8/18 + 9/18 ... see note below

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----------------

note: To go from 4/9 to 8/18, we multiply top and bottom by 2. So that's why 4/9 = 8/18.

The diagram below shows a visual representation of why 4/9 = 8/18.

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