Question

How it came 21x^3 in place of 7x^2 in the first step
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Answer 1

Answer:

7x²×3x

=21x³

This is done here

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Answer 2

Step-by-step explanation:

Here, in the first step it is written :

7x^2 (3x-9) +3

Now

7x^2 * 3x = 21x^3

As

7*3 becomes 21 anf x^2 and x geys multiplied to becomes x^3

So the reult is 21 x^3

And the equation becomes

21x³ - 63x² +3

Hope it helps you :)