Tutors Answer Your Questions about Linear Algebra (FREE)
Question 430834: I'm trying to help my niece with an algebra problem that has both of us stumped...
(s+t)(s-t)(s+t)(s-t)
The answer provided in her book is:
s^4-2t^2s^2t^2
I can't even get close to this answer. I got the s^4 and think I got the s^2 and t^2, but I can't figure out the -2t^2.
If you can tell me what I'm doing wrong, I'd appreciate it.
I came up with:
(s)(s)(s)(s) = s^4
(t)(-t)(t)(-t) = t^2
I am so confused right now, I don't know what to do. It's been years since I had Algebra.
Click here to see answer by shree840(260)   |
Question 430834: I'm trying to help my niece with an algebra problem that has both of us stumped...
(s+t)(s-t)(s+t)(s-t)
The answer provided in her book is:
s^4-2t^2s^2t^2
I can't even get close to this answer. I got the s^4 and think I got the s^2 and t^2, but I can't figure out the -2t^2.
If you can tell me what I'm doing wrong, I'd appreciate it.
I came up with:
(s)(s)(s)(s) = s^4
(t)(-t)(t)(-t) = t^2
I am so confused right now, I don't know what to do. It's been years since I had Algebra.
Click here to see answer by mananth(16946)  |
Question 430834: I'm trying to help my niece with an algebra problem that has both of us stumped...
(s+t)(s-t)(s+t)(s-t)
The answer provided in her book is:
s^4-2t^2s^2t^2
I can't even get close to this answer. I got the s^4 and think I got the s^2 and t^2, but I can't figure out the -2t^2.
If you can tell me what I'm doing wrong, I'd appreciate it.
I came up with:
(s)(s)(s)(s) = s^4
(t)(-t)(t)(-t) = t^2
I am so confused right now, I don't know what to do. It's been years since I had Algebra.
Click here to see answer by Alan3354(69443)  |
Question 431841: The stretch in a wire under a given tension varies directly as the length of the wire and inversely as the square of its diameter. If the length and the diameter of a wire are both doubled, what is the effect on the stretch of the wire?
Please and thank you!! :)
Click here to see answer by mananth(16946) |
Question 432426: Mary has two tanks of fish. If she transfers 15 fish from the larger tank to the smaller tank, then the number of fish in the smaller tank will be 5/7 of fish in the larger tank. Given that there are 35 fish in the smaller tank originally, find the number of fish in the larger tanik before the transfer of fish.
Click here to see answer by belle3833(46)  |
Question 432428: As part of the 'learning journey'program, 73 pupils travelled on two buses, one air-conditioned and one non-air-conditioned, to the Singapore Discovery Centre. Three-fifths of the pupils on the air-conditoned bus were girls. There were 17 boys in the non-air conditioned bus. The number of girls on the two buses were equal. How many pupils were there on the air-conditioned bus?
Click here to see answer by htmentor(1343)  |
Question 436290: I think I picked the right area for this [?].
I am at a loss to set this one up in formulas.
I get the rate/minute idea but get lost setting up an equation to get the answer.
Thank you.
A fire engine starts pumping water at 9:20 am at the rate of 800 gallons per minute. Another fire engine, pumping at the rate of 1,000 gallons per minute, starts at 9:30 am. At what time will the 2 engines have pumped the same number of gallons?
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 438818: Solve the system by elimination
0.5x + 2y = 2.25
3x + 12y = 13.5
If the system is dependent, use a to represent any real number.
Can you please help me solve this? I came up with the answer: (a, 0.5a + 2.5) but it is saying that it is incorrect.
Click here to see answer by Alan3354(69443) |
Question 440051: I have a problem it said, complete table, find vertex, intercepts and sketch the graph, problem is f(x)=(x-1)^2-1, the table is x -2,1,0,1,2; y ?,?,?,?,?; xy ?,?,?,?,?. Can anyone help me?
Click here to see answer by Gogonati(855)  |
Question 442095: I know there is not a section, but if anyone can help with the following problem, it will be greatly appreciated.
Find the average rate of change for the function over the given interval.
y = x2 + 7x between x = 1 and x = 8
Click here to see answer by ilana(307) |
Question 442727: Determine whether the given simplex tableau is in final form. If so, find the solution to the associated regular linear programming problem. If not, find the pivot element to be used in the next iteration of the simplex method.
1. x y u v P | Constant
-------------|---
1 1 1 0 0 | 6
1 0 -1 1 0 | 2
-------------|---
0 0 5 0 1 | 30
I know that the simplex tableau is in final form because there are no negative numbers to the left of the vertical line in the last row. The thing I don't know is how to find the solution to the associated regular linear programming problem.
Click here to see answer by stanbon(75887) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760
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