Tutors Answer Your Questions about Radicals (FREE)
Question 1039638: Hi there, I'm having difficulty with this problem and could really use your help!
verify the given formula by showing the left hand side of the equation simplifies to the right hand side of the equation.
Difference of Cubes: (a - b)(a^2 + ab + b^2) = a^3 - b^3
I'm not sure where to begin here. I would really appreciate your guidance. Thank you!
Click here to see answer by Alan3354(69443)   |
Question 1039852: I need your help on this problem please!
Solve the equation. Check all proposed solutions. Show work in solving and in checking, and state your final conclusion.
√(15-2x)=6-x
I don't know where to begin, thank you very much for any help!
Click here to see answer by Fombitz(32388)  |
Question 1039862: I could really use some help on this quadratic, I'm lost! :
QUADRATIC REGRESSION
Data: On a particular spring day, the outdoor temperature was recorded at 8 times of the day. The parabola of best fit was determined using the data.
Quadratic Polynomial of Best Fit:
y = -.2t^2 + 6.3t + 42.9 for 0 less than or equal to t less than or equal to 24 where t = time of day (in hours) and y = temperature (in degrees)
REMARKS: The times are the hours since midnight.
For instance, t = 6 means 6 am. t = 22 means 10 pm.
t = 18.25 hours means 6:15 pm
(a) Use the quadratic polynomial to estimate the outdoor temperature at 6:30 am, to the nearest tenth of a degree.
(b) Using algebraic techniques we have learned, find the maximum temperature predicted by the quadratic model and find the time when it occurred. Report the time to the nearest quarter hour (i.e., __:00 or __:15 or __:30 or __:45). (For instance, a time of 18.25 hours is reported as 6:15 pm.) Report the maximum temperature to the nearest tenth of a degree. Show algebraic work.
(c) Use the quadratic polynomial y = -0.2t^2 + 6.3t + 42.9 together with algebra to estimate the time(s) of day when the outdoor temperature y was 82 degrees.
That is, solve the quadratic equation 82 = -0.2t^2 + 6.3t + 42.9.
Show algebraic work in solving. Round the results to the nearest tenth. Write a concluding sentence to report the time(s) to the nearest quarter-hour, in the usual time notation. (Use more paper if needed)
I really appreciate any help that can be offered! Thank you so much!
Click here to see answer by josgarithmetic(39616) |
Question 1040483: I am having trouble with this question: "What is the product of (y+2)(y-8)? The answers available are
y^2+6y-16 , y^2-6y-16 , y^2-6y+16 , y^2+6y+16 . Please explain how you got the correct answer, thank you so much in advance , Emily.
Click here to see answer by Theo(13342)  |
Question 1040483: I am having trouble with this question: "What is the product of (y+2)(y-8)? The answers available are
y^2+6y-16 , y^2-6y-16 , y^2-6y+16 , y^2+6y+16 . Please explain how you got the correct answer, thank you so much in advance , Emily.
Click here to see answer by MathTherapy(10551)  |
Question 1040542: I need help solving this problem please!
f(x) = sqrt(x+5) and g(x)=x-3
I need to find (f/g)(-1) and I'm coming up with:
sqrt((x+5)(x-3))/ x-3
I'm also asked to find the domain and come up with:
(−∞,−5]∪(3,∞)
am I on the right track?
Thank you for any guidance!
Click here to see answer by stanbon(75887) |
Question 1040542: I need help solving this problem please!
f(x) = sqrt(x+5) and g(x)=x-3
I need to find (f/g)(-1) and I'm coming up with:
sqrt((x+5)(x-3))/ x-3
I'm also asked to find the domain and come up with:
(−∞,−5]∪(3,∞)
am I on the right track?
Thank you for any guidance!
Click here to see answer by Aldorozos(172) |
Question 1040625: I could really use some help on this problem please!
I'm trying to find the diameter of a circle with the two points (-1, 0) and -9, -8).
This is what I've come up with, but I"m not sure if it's correct:
√((-1-(-9) )^2+(0-(-8))^2)
8^2 + 8^2
64 + 64
128
Any help is greatly appreciated!
Click here to see answer by jim_thompson5910(35256) |
Question 1040625: I could really use some help on this problem please!
I'm trying to find the diameter of a circle with the two points (-1, 0) and -9, -8).
This is what I've come up with, but I"m not sure if it's correct:
√((-1-(-9) )^2+(0-(-8))^2)
8^2 + 8^2
64 + 64
128
Any help is greatly appreciated!
Click here to see answer by ikleyn(52776)  |
Question 1040626: I'm needing some help on this. I submitted earlier, but I didn't get a confirmation it went through:
I have two points end points on a circle and I need to find the diameter: (–1, 0) and (–9, –8) and I need to find the diameter.
I've come up with this, but I"m not sure if it's accurate:
√((-1-(-9) )^2+(0-(-8))^2)
8^2 + 8^2
64 + 64
128
any help is greatly appreciated!
Click here to see answer by Boreal(15235)  |
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