Tutors Answer Your Questions about Radicals (FREE)
Question 583100: solve the following system bu substitution
x=7y+9
x=7/4y
what is the solution set?
solve by the substitution method.
x-y=-1
7x+3y=-67
what is the solution set?
solve by the elimination method.
2x-5y=36
5x+7y=-27
what is the solution set?
use the elimination method to solve the system of equations.
5x+4y=5
-7x-8y=-19
what is the solution set?
Click here to see answer by solver91311(17077)   |
Question 583100: solve the following system bu substitution
x=7y+9
x=7/4y
what is the solution set?
solve by the substitution method.
x-y=-1
7x+3y=-67
what is the solution set?
solve by the elimination method.
2x-5y=36
5x+7y=-27
what is the solution set?
use the elimination method to solve the system of equations.
5x+4y=5
-7x-8y=-19
what is the solution set?
Click here to see answer by JBarnum(2044)  |
Question 585555: I'm taking Geometry, but never learned how to simplify square roots. I can do the simple ones such as √24, but more comlicated ones such as 3√27, I cannot. So, for 3√27, I broke 27 into 9 x 3, and then the 9 into 3 x 3, but I don't even know if that's right or where to go from there. Sorry if that was confusing. I'm asking how 3√27 is simplified. That's it. Thank you, very much
Click here to see answer by mananth(12270)  |
Question 586965: The formula for the volume of a sphere is V=4/3πr^3. Find the radius of a sphere with each volume.
1. 10 in^3
2. 20 ft^3
3. 0.45 cm^3
4. 0.002 mm^3
I tried doing the problems like this: 10/4/3π; it's not the right way, but I don't know how. It has to be answered as a radical expression. How do I do that?
Click here to see answer by Alan3354(31538)  |
Question 587894: The speed of a passenger train is 16 mph faster than the speed of a freight train. The passennger train travels 300 miles in the same time it takes the freight train to travel 220 miles. What is the speed of each train?
Click here to see answer by mananth(12270) |
Question 588089: Problem: Find the inverse of  .
I've fought the good fight, working on this on and off for two weeks.
Status:
For x^2 + x^1/2 = y, the equivalent is x = x^4 - 2x^2y + y^4. I cannot figure out what algebraic manipulative trick(s) to use to separate x, and render it as ONE X term in terms of y. [x = f(y)] Do you have a bag of such applicable tricks?
Since I can't manage that, here's another approach:
x^1/2 = y - x^2 and -(x^1/2) = X^2 - y.
While x^1/2 is not = -(x^1/2), (x^1/2)^2 = x and [-(x^1/2)]^2 = x.
Therefore: x = (y - x^2)^2 and x = (x^2-y)^2.
Now take the square root of each of the above:
x^1/2 = y - x^2 and x^1/2 = x^2 - y.
(Of course, the sq rts can also have a "-" sign.)
Therefore: y - x^2 = x^2 - y.
Is my logic correct so far?
(HOWEVER, in the expression above, let x = 1, and y>1.
If y = 4, 4 - 1 NOT = 1 - 4.)
In any event, if my logic holds up, it seems that I can write:
-2x^2 = -2y AND 2x^2 = 2y.
Each of these is a quadratic. So, it seems that I should be able to use
ax^2 + bx + c = (d)y
inputing known values of x and y [x = 1, y = 2; x = 4, y = 18], and come up with a specific quadratic equation of some form of:
x = -b/2a +/- [(sqrt b^2 + y - 4ac)/2a]
I'll leave it at that. Thanks so much. Cheers!
Click here to see answer by ankor@dixie-net.com(15747)  |
|
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, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190
|
