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cestrela7 [59]
2 years ago
8

3(x+3)-5x simplify Answer

Mathematics
2 answers:
Lelu [443]2 years ago
7 0

Answer: -2x + 9

First, Use the distributive property: 3(x+3)-5x       (3 multiplied by x is 3x and 3 multiplied by 3 is 9

Next, subtract the variable x: 3x+9-5x      (3x-5x=-2x

The answer is -2x+9

JulsSmile [24]2 years ago
7 0

Answer:

-2x + 9

Step-by-step explanation:

1. First, working from left to right and following PEMDAS, distribute the 3 into the parentheses:

Distribute is to multiply each number or variable in the parentheses by the outer number.

(3·x + 3·3) - 5x

2. Simplify inside the parentheses:

(3x + 9) - 5x

3. Now combine like terms:

3x - 5x + 9

which simplifies to,

-2x + 9

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Two passenger train, A and B, 450 km apart, star to move toward each other at the same time and meet after 2hours.
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Let v be the speed of train A, and let's set the origin in the initial position of train A. The equations of motion are

\begin{cases}s_A(t) = vt\\s_B(t) = -\dfrac{8}{7}vt+450\end{cases}

where s_A,\ s_B are the positions of trains A and B respectively, and t is the time in hours.

The two trains meet if and only if s_A=s_B, and we know that this happens after two hours, i.e. at t=2

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Solving this equation for v we have

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3 years ago
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