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8090 [49]
3 years ago
5

Find the common difference, d, given that 8x-3, 4x+1, 2x-2 are consecutive terms of an

Mathematics
2 answers:
VladimirAG [237]3 years ago
8 0

Answer:

B.) <em>-</em><em> </em><em>1</em><em>0</em> is the answer.

Step-by-step explanation:

<h3>#CarryOnLearning</h3>
Pavel [41]3 years ago
3 0

Answer:

B

Step-by-step explanation:

We are given that:

8x-3, \, 4x+1, \text{ and } 2x-2

Are consecutive terms of an arithmetic sequence.

And we want to determine the common difference <em>d</em>.

Recall that for an arithmetic sequence, each subsequent term is <em>d</em> more than the previous term.

In other words, the second term is one <em>d</em> more than the first term. So:

4x+1=(8x-3)+d

And the third term is two <em>d</em> more than the first term. So:

2x-2=(8x-3)+2d

We can isolate the <em>d</em> in the first equation:

-4x+4=d

As well as the second:

-6x+1=2d\Rightarrow \displaystyle -3x+\frac{1}{2}=d

Then by substitution:

\displaystyle -4x+4=-3x+\frac{1}{2}

Solve for <em>x:</em>

<em />\displaystyle -x=\frac{-7}{2}\Rightarrow x=\frac{7}{2}<em />

<em />

The isolated first equation tells us that:

d=-4x+4

Therefore:

\begin{aligned} \displaystyle d&=-4\left(\frac{7}{2}\right)+4\\&=-2(7)+4\\&=-14+4\\&=-10 \end{aligned}

Our final answer is B.

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