Choose the correct conic section to match the equation. y 2 = 36x
Question
Updated 2/12/2015 7:58:07 PM
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Original conversation
User: Find the roots. 2x 2 + 4x - 5 =0

User: Choose the correct conic section to match the equation. y 2 = 36x

Weegy: The conic section for the equation y^2 = 36x is Parabola.

User: Choose the best description of the roots of the equation 3x 2 - 4x + 5 = 0.

User: Simplify the expression. (-4 + 7i)(-4 - 7i)

Question
Updated 2/12/2015 7:58:07 PM
This conversation has been flagged as incorrect.
Rating
3
(-4 + 7i)(-4 - 7i) = (-4)^2 - (7i)^2 = 16 - 49i^2
if i^2 = -1, 16 - 49i^2 = 16 - 49(-1) = 16 + 49 = 65
Confirmed by sujaysen [2/13/2015 6:52:35 AM]
3
3x^2 - 4x + 5 = 0
a = 3, b = -4, c = 5
b^2 - 4ac = (-4)^2 - 4(3)(5) = 16 - 60 = -44 < 0
there are two complex roots for the equation 3x^2 - 4x + 5 = 0.
3
2x^2 + 4x - 5 =0
a = 2, b = 4, c = -5
b^2 - 4ac = 4^2 - 4(2)(-5) = 16 + 40 = 56 > 0
there are two real roots for the equations and the roots are:
x = (-4 ± sqrt 56)/4
= (-4 ± 2 sqrt 14)/4
= (-2 ± sqrt 14)/2

Questions asked by the same visitor
x 2 - 5x + _____ = 7 User: One jar holds 16 red marbles and 4 blue marbles. A second jar holds 75 white marbles and 25 blue marbles. What is the probability that a blue marble will be drawn from both jars?
Weegy: The answer is 1/20, since 4/16 X 25/75 = 1/5 X 1/4. User: 4x 2 - 25y 2 = 100 Weegy: 5x - ( 4x - 1) = 2 x+1=2 x = 2 - 1 x = 1 User: Select the conic section that represents the equation. 4x 2 - 25y 2 = 100 circle ellipse hyperbola parabola Weegy: 5x - ( 4x - 1) = 2 x+1=2 x = 2 - 1 x = 1 User: Simplify the expression. 2(x + 3)(x + 4) 2(x + 3) 2(x - 3)(x + 4) User: How many subsets of at least one element does a set of six elements have? Weegy: The number of subsets of n elemnets = 2^n but this also includes a null set, because a null set is a subset of every set So in our problem = 2^6 -1 = 63 subsets User: Find the distance between the points. (2, 3) and (-3, -6) Weegy: The distance between C(0, 4), T(-6, -3) is 9.22. User: Use a scientific calculator to evaluate ln 26 (round to the nearest ten-thousandth). 1.4150 3.2581 32.5813 0.1415 Weegy: ln 26 = 3.2581. User: Simplify. log412 + log47 log4 log419 log484 log45 (More)
Question
Updated 2/12/2015 10:20:51 PM
The conic section for the equation 4x^2 - 25y^2 = 100 is Hyperbola.
The distance between the points. (2, 3) and (-3, -6) is 106^1/2 .
distance^2 = (2 + 3)^2 + (3 + 6)^2
= 25 + 81
= 106
distance = 106^1/2
Confirmed by sujaysen [2/13/2015 6:56:00 AM]
Solve for x. 8x + 2 - 5 = 11 User: Find the equation for a hyperbola centered at (0, 0), with foci at (-, 0) and (, 0) and vertices at (3, 0) and (-3, 0).
Question
Updated 2/12/2015 3:48:36 PM
8x + 2 - 5 = 11;
8x - 3 = 11;
8x = 11 + 3;
8x = 14;
x = 14/8;
x = 7/4
Find the simplest form of the general term for the sequence 11, 15, 19, 23, . . .
Weegy: The simplest form of the general term for the sequence 11, 15, 19, 23, . . . is: 4n-1. User: Find the equation of a circle that has its center at (-4, 3) and has a radius of 5. User: Twelve children play musical chairs. If there are three chairs, how many ways are there for three children to sit? Weegy: The answer is 36 ways. User: Twelve children play musical chairs. If there are three chairs, how many ways are there for three children to sit? 220 1,320 660 (More)
Question
Updated 2/13/2015 12:09:25 AM
The simplest form of the general term for the sequence 11, 15, 19, 23, . . . is 4n + 7 .
common difference = 23 - 19 = 4
An = 11 + (n - 1)*4
An = 11 + 4n - 4
An = 4n + 7

Confirmed by sujaysen [2/13/2015 6:58:32 AM]
Twelve children play musical chairs. If there are three chairs, there are 1320 ways for three children to sit.
12*11*10 =1320
29,298,809
*
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