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Tutors Answer Your Questions about Square-cubic-other-roots (FREE)
Question 90921: Hello,
I cannot find topic - Factoring a Perfect-Square Trinomial
My problem is:
16x^2 - 40x + 25 - Okay I know that the first & third #'s need to squared.
But I'm getting lost trying to break it down.....the examples gives:
(4x)^2 - 2(4x)(5)+ 5^2 = (4x-5)^2
I just can't seem to figure out how they got there.
Thanks for any help you can give...hope it makes sense...
Cristina
Click here to see answer by scott8148(6628)   |
Question 91108: I submitted this question and got an answer but it's not one of the answer choices on my lesson sheet. I follow your explanation until step 5-6 then I don't understand the rest. I am reposting the same question with the answer choices this time. I'm thinking the answer is "b" by the answer you came up with. Do you agree?
What is the square root of 162x^6 over 64x^2
The answer choices are: a. 3x^2 sq. root 2 over 8; b. 9x^2 sq. root 2 over 8
or c. 3x^2 sq. root 2 over 4 Thank you once again for your help.
Click here to see answer by jim_thompson5910(35256) |
Question 91108: I submitted this question and got an answer but it's not one of the answer choices on my lesson sheet. I follow your explanation until step 5-6 then I don't understand the rest. I am reposting the same question with the answer choices this time. I'm thinking the answer is "b" by the answer you came up with. Do you agree?
What is the square root of 162x^6 over 64x^2
The answer choices are: a. 3x^2 sq. root 2 over 8; b. 9x^2 sq. root 2 over 8
or c. 3x^2 sq. root 2 over 4 Thank you once again for your help.
Click here to see answer by Earlsdon(6294) |
Question 91372: I thought biology was difficult, geez. I don't see any potential solutions for the 1st question. the x's cancel each other out. wait x = -2 by subtracting 2 from both sides gives x = -2?
1.sq root /x + 2 - x = 0 any potential solutions? Cancel out the x’s
This is undefined?
2.
C computes the cost in millions of $ of implementing a city infastructure project when x percent of the citizens participate.
C(x) = 1.5x / 100-x
Using this model, approximately what is the cost if 40% of the citizens participate?
Using this model, estimate the percentage of participation that can be excepted if $5 million is spent on this infastructure project? Set up an equation and solve algebraically. Round to the nearest whole percent.
3.
Suppose that N=squarerootx +2 models the number of cases of an infection, in millions, of a disease x years from now.
a) Approximately how many cases of the infection will there be 16 years from now?
b) In approximately how many years will there be 7 million cases?
Click here to see answer by stanbon(75887) |
Question 91410: Suppose that N= squarerootx +2 models the number of cases of an infection, in millions, of a disease x years from now.
a) Approximately how many cases of the infection will there be 16 years from now?
b) In approximately how many years will there be 7 million cases?
Click here to see answer by stanbon(75887) |
Question 91411: 5) For the following function, C computes the cost in millions of dollars of implementing a city recycling project when x percent of the citizens participate. C(x)=1.5x/100-x
a) Using this model, approximately what is the cost if 40% of the citizens participate?
b) Using this model, estimate the percentage of participation that can be excepted if $5 million is spent on this recycling project? Set up an equation and solve algebraically. Round to the nearest whole percent.
Click here to see answer by checkley71(8403) |
Question 91621: Is the following binomial a difference of squares 9a^2 - 8b^2? I have no idea how to even begin to approach this question. Obviously the answer yes or no would be appreicated, but more importantly why it is such. Thank you in advance.
Click here to see answer by Earlsdon(6294) |
Question 91621: Is the following binomial a difference of squares 9a^2 - 8b^2? I have no idea how to even begin to approach this question. Obviously the answer yes or no would be appreicated, but more importantly why it is such. Thank you in advance.
Click here to see answer by stanbon(75887) |
Question 91725: Can I get help with this one too: solve by completing the square
2x^2=2x+15
answer choices:
a. 1 +or- square root 29
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2
b. 1 +or- square root 31
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2
c. 2 +or- square root 22
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2
Click here to see answer by scott8148(6628) |
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