Answer:
We have expanded formula of (-4x-1)² = a²+2ab+b².
So, we write the formula in square form as (a+b)².
Since we have a²-b² in step 4. We further write this as (a+b)(a-b). This is the factor formula of a²-b².
As we had two terms in place of in (a+b)(a-b), we multiply the term 'b' with '+' and '-' sign respectively.
Write the second expression given in the question.
Write the terms in the form of cube.
Write the factor formula of a³-b³) in the form of (a-b)(a²+ab+b²).
Write the H.C.F. (Highest Common Factor) of the given expressions by analysing the factors you generated in each expressions. Here, (4x²+2x+1) are the common factors.
<span>Answer:
21 document= 1 error
120 document= 1 hour
in three and a half hours= 21 mistakes</span>
Answer:

Step-by-step explanation:
368%
<em>convert to a fraction</em>

<em>divide top and bottom by 2</em>
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<em>divide top and bottom by 2</em>
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92/25 = 3 remainder 17
