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77julia77 [94]
3 years ago
11

If A=x-1 and B=x+2, find an expression that equals 3A−3B in standard form.

Mathematics
2 answers:
Hunter-Best [27]3 years ago
7 0
<h2>Answer :-</h2>

A = x - 1

3A = 3 * (x - 1) = 3x - 3

B = x + 2

3B = 3*(x + 2) = 3x + 3*2 = 3x + 6

3A - 3B = 3x - 3 - (3x + 6) = 3x - 3 + 3x*(-1) - 6*(-1)

            = 3x - 3 -3x - 6

            = 0 - 9

      \bf{     = -9}

\tt{ \verified} \red  {\:  \: \checkmark}

Paul [167]3 years ago
3 0

Answer:

-9

Step-by-step explanation:

A = x - 1

3A = 3 * (x - 1) = 3x - 3

B = x + 2

3B = 3*(x + 2) = 3x + 3*2 = 3x + 6

3A - 3B = 3x - 3 - (3x + 6) = 3x - 3 + 3x*(-1) - 6*(-1)

            = 3x - 3 -3x - 6

            = 0 - 9

           = -9

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alexdok [17]

Answer:

The answers A, B, and C all work for this problem. The answer D is the only one that does not.

Step-by-step explanation:

When looking at two parenthesis being multiplied together and being equal to 0, we know that at least one of the parenthesis must be equal to 0 for it to be true. In A and C, the first parenthesis will be equal to 0 due to a = -6.

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Alaina bought a square frame for her desk that has an area of 81 square inches. What is the perimeter of the frame? (answer shou
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