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Len [333]
3 years ago
10

Solve for x in the equation 3x^2-18+5=47​

Mathematics
1 answer:
Alecsey [184]3 years ago
3 0

Answer:

\sqrt{20}

Step-by-step explanation:

<em> </em><em>Try to leave x alone on the left side</em>

3x^{2}  -18 + 5 = 47

3x^{2}  -13  = 47

<em>To leave alone x, add +13 to both sides. Because left side has -13</em>

3x^{2}  -13 + 13  = 47 + 13

3x^{2}  = 60

<em>Now x is alone on the  left side</em>

\frac{3x^{2} }{3} = \frac{60}{3}

x^{2}  = 20

  • \sqrt{x} .\sqrt{x} = x  <=Rule

So; x=\sqrt{20}

Hope this helps ^-^

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This math promblem!!!!
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1. You convert all the numbers into decimals.
   a. For 8 1/9 you multiply 8x9 and add the numerator which in this case is one, so the equation would be 8x9=72     then 72+1= 73
   b. For 81/10 I used a calculator for accuracy and I just divided 81 by 10 because the fraction line can also be used as a division sign. For this I got 8.1
2. Now I looked at all the numbers I had including the fractions I converted to decimals... 8.115, 8.55, 73, and 8.1
3. Lastly, I put the numbers in order from least to greatest: 8.1, 8.115, 8.55, and 73
4. In order to figure out which one is the smallest and largest, I just added zeros on the end of the numbers so they would all be the same: 8.1-->8.100, 8.115 I kept the same because it already had 3 decimal places, 8.55--> 8.550, and 73--> 73.000
5. Then i could tell which number was the largest by the decimal place numbers.
**Hope this was helpful... It's kind of hard to explain online but hopefully you have a better understanding of how to do it!**
6 0
3 years ago
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What is the range of y=|2x-1|
zepelin [54]

Answer:

[0,∞) {y║y≥0}

Step-by-step explanation:

The absolute value expression has a V shape. The range of a positive absolute value expression starts at its vertex and extends to infinity.

3 0
3 years ago
Who is Mitt Romney  for math I am in 4th grade
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4 years ago
Identify the horizontal asymptote of f(x) =x2+5x-3/4x-1
Pachacha [2.7K]

since the numerator is x² + 5x - 3, and therefore has a degree of 2, whilst the denominator, 4x¹ - 1, has a degree of 1, therefore, there's no horizontal asymptote.

recall, we only get a horizontal asymptote if the denominator's expression degree is equals or greater than that of the numerator's.

5 0
4 years ago
You have to multiply 7 by 19. Which equation uses the Distributive Property to take this problem apart?
grigory [225]

Answer: Choice A

7(10+9) = 70 + 63

============================

Explanation:

when we multiply 7 by 19, we start off multiplying just 7*9 = 63 so just focus on the units or ones digit of 19 to have it multiply with 7. We have 63 as the result so we write down "3" as part of the answer, and carry the 6.

Then you move onto the tens digit. The tens digit of 19 is 1. Multiply 1 by 7 and we get 7, which adds on to the carry digit 6 to get 7+6 = 13. Therefore we'll stick a 13 in front of the 3 we got earlier to end up with the final answer 133

---------------

Using the distribution rule is much easier in my opinion

19 = 10+9

7*19 = 7*(10+9)

7*19 = 70+63

7*19 = 133

The idea is to multiply the outer 7 by each term inside the parenthesis

7*(10+9) = 7*10 + 7*9 = 70 + 63

So we multiplied the 7 by the 10 first to get 7*10 = 70

Then did the same for the 9 term as well 7*9 = 63

After those two multiplications, we add the results up: 70+63 = 133

4 0
4 years ago
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