Tutors Answer Your Questions about Quadratic Equations (FREE)
Question 498634: When filling in the table of values for y = x^2, I noticed the values of y differ by a series of odd numbers: if x = 0, 1, 2, 3, 4... then y = 0, 1, 4, 9, 16... the y values differing by 1, 3, 5, 7... For y = (1/8)(x-4)^2 +5, the x values 4, 5, 6, 7... give y = 5, 5.125, 5.500, 6.125, 7... which works out to a difference of 1*(1/8), 3*(1/8), 5*(1/8), 7*(1/8)...
Why does this happen?
Click here to see answer by richard1234(7193)   |
Question 498825: I don't understand how to solve this problem. Thank you.
It says solve and check the quadratic equation below by taking the square root of both sides. Express irrational answers in rational form.
(x-10)^2=4
thank you so much
Click here to see answer by Theo(13342)  |
Question 498924: use the discriminant to determine the number of solutions and whether they are real or complex.
x^2 + 6x - 7 = 0
z^2 + z + 1 = 0
(3)^1/2 y^2 - 4y - 7(3)^1/2 = 0
I can not figure these three out. Please help! Thanks
Suzie
Click here to see answer by chessace(471)  |
Question 499020: By increasing her usual speed by 25 kilometers per hour, a bus driver decreases the time on a 25-kilometer trip by 10 minutes. Find the usual speed.
The Vilas County News earns a profit of $20 per year for each of its 3,000 subscribers. Management projects that the profit per subscriber would increase by 1¢ for each additional subscriber over the current 3,000. How many total subscribers are needed to bring a total profit of $113,100?
Perform the operations and simplify. 1/x times x^2-15x all over x-14
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 499114: Ignoring wind resistance, the distance "d" in feet that a parachute falls in "t" seconds can be estimated using this formula d= 16t^2. If a parachutist jumps from an airplane and falls for 1100 feet before opening the parachute, how many seconds pass before the parachute is opened?
Click here to see answer by ankor@dixie-net.com(22740) |
Question 499226: quadratic equations
i am not looking for the working out of this question
3 - 2x - 8x^2
how do you get it to resemble the formula
ax^2 + bx + c
do you bring the 8x^2 to the left side and make it positive as well as te 2x?
Click here to see answer by nerdybill(7384)  |
Question 499267: 9^(7-2)=1/243
please help,
at first i changed the left and right numbers into values that were similar
(3^2)^(7-2x) = 1/3^5
were would i go from here and explain the laws of indices needed to solve this problem
Click here to see answer by Alan3354(69443)  |
Question 499392: In questions 6-10, use the discriminant to determine the number of solutions of the quadratic equation, and whether the solutions are real or complex. Note: It is not necessary to find the roots; just determine the number and types of solutions
4/3x^2 -2x + 3/4 = 0
This is the one that has me going in circles please help.
Suzie
Click here to see answer by jim_thompson5910(35256) |
Question 499477: For the following equation, state the value of the discriminate and then describe the nature of the solutions. -19x^2+8x+8=0
What is the value of the discriminant?
Which one of the statements below is correct?
A-The equation has two imaginary solutions.
B-The equation has two real solutions.
C-The equation has one real solution.
Click here to see answer by MRperkins(300)  |
Question 501665: please help me about this problem : one leg of a right triangle is 1 cm longer than the other leg, and the hypotenuse is 2 cm longer than the shorter leg. Find the lengths of the three sides of the triangle.I think the legs are 3 and 4 cm and the hypotenuse is 5 cm. but iam not sure about it, i need a solution and some explanation for this, i will also report this tomorrow on our class. please help me. thank you.
Click here to see answer by geetha_rama(94) |
Question 501814: I need help solving the following... I have to simplify and then solve using the quadratic formula but I am getting stuck something is not right.. I have started to simplify but end up canceling out the 3x but don't I need that??? Grrrr Help please!!!
x(x+3)-2=3x+7
Click here to see answer by Alan3354(69443) |
Question 501814: I need help solving the following... I have to simplify and then solve using the quadratic formula but I am getting stuck something is not right.. I have started to simplify but end up canceling out the 3x but don't I need that??? Grrrr Help please!!!
x(x+3)-2=3x+7
Click here to see answer by jorel1380(3719)  |
Question 502349: Please help me I appreciate it
1.
Describe the graph of the quadratic function f(x) = -x2 + 7x + 8 by identifying the following:
the concavity of the graph;
the vertex;
the line of symmetry;
the x-intercepts and y intercept;
Justify your answers by showing work or providing a logical explanation.
Additional Instructions:
Describe the graph algebraically; in other words, without graphing.
Show work to support your answers.
Click here to see answer by lwsshak3(11628) |
Question 503233: Ron and Kathy are ticket-sellers at their class play, Ron handling student tickets that sell for $2.00 each and Kathy selling adult tickets for $4.50 each. If their total income for 20 tickets was $60.00, how many did Ron sell?
Click here to see answer by Maths68(1474)  |
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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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