Tutors Answer Your Questions about Quadratic Equations (FREE)
Question 239003: Winter Wheat question: WHile finding the amount of seed needed to plant his three square wheat fields, Hank observed that the side of one field was 1 Kilometer longer than the side of the smallest field and that the side of the largest field was 3 kilometer longer than the side of the smallest field. If the total area of the three fields is 38 square kilometers, then what is the area of each field?
x^2+(x+1)^2=(x+3)^2=38
Used the foil method to solve (x+1)(x+1) and (x+3)(x+3)
x^2+x^2+2x+1+x^2+6x+9=38
3x^2+8x+10=38
3x^2+8x-28=0
I know this is wrong because I can't solve.
Any suggestions?
Click here to see answer by scott8148(6628)   |
Question 239007: Venture Capital:
Henry invested $12000 in a new resturant. When the resturant was sold two years later, he received $27000. Find the average annual return by solving the equation 12,000(1+r)^2=27000.
used the foil to solve the (1+r)^2 or (1+r)(1+r)
12000(1+2r+r^2)=27000
12000+24,000r+12000r^2=27000
-15000+24,000r+1200r^2=0
THis is as far as I could get. Not sure my next step.
Click here to see answer by scott8148(6628) |
Question 239234: A flagpole is secured on opposite sides by two guy wires, each of which is 5 ft. longer than the pole. The distance between the points where the wires are fixed to the ground is equal to the length of one guy wire. How tall is the flagpole (to the nearest inch)?
Click here to see answer by Photonjohn(42) |
Question 239988: Doing a quadratic equation problem, i cam across a problem. the equation i got was x^2-6c-3=0. When plugging this problem into the equation, x=-b+/-(sqrt(b^2+4ac))/2a, I did not know if you could plug the b value (-3) into the place of -b or if you had to make it a positive b.
Click here to see answer by JimboP1977(311)  |
Question 239988: Doing a quadratic equation problem, i cam across a problem. the equation i got was x^2-6c-3=0. When plugging this problem into the equation, x=-b+/-(sqrt(b^2+4ac))/2a, I did not know if you could plug the b value (-3) into the place of -b or if you had to make it a positive b.
Click here to see answer by solver91311(24713)  |
Question 240469: a farmer with 4000 meters of fencing wants to encloce a rectangular plot that borders on a river.
*if the farmer does not fence the side along the river, what is the largest area that can be enclosed?
*provide the area function used and graph it. Identify the maximum and interpret what it means.
Click here to see answer by checkley77(12844) |
Question 240797: I need to a step by step solving this equation:0= x^2+15x-1350 , This is from a word problem using quadratic equation solving cost per person.... I know the answer but I do not know how they got it....help please
Click here to see answer by vleith(2983) |
Question 240344: A horse breeder wants to construct a corral next to his horse barn that is 50 feet long, using all of the barn as one side of the corral. He has 250 feet of fencing available and wants to use all of it. What is the maximum area of the corral?
There's a picture of it here: http://math.library.wisc.edu/reserves/114/114-nenciu-09spex01.pdf (question #5)
Help? I'm so confused!
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 240782: The pitch P of a musical tone varies inversely as its wavelength W. One tone has a pitch of 283 vibrations per second and a wavelength of 12 ft. Fine the wavelength of another tone that has a pitch of 348 vibrations per second.
Click here to see answer by Alan3354(69443)  |
Question 240880: I got this reply back for my question....I can't find an answer unless I am doing something wrong. Thanks for checking into it for me!
Question 240789: Hello,
I need some help to:
1. Solve the following equation using quadratic formula
2x^2-3x-1=0
The solution set is? ________
Thanks!!
Answer by vleith(1971) About Me (Show Source):
Click here to see answer by Alan3354(69443) |
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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, 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