What is the solution set of 2x 2 + x = 15?

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Asked 10/23/2013 11:42:27 AM

Updated 9/1/2014 11:22:58 AM

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Question

Asked 10/23/2013 11:42:27 AM

Updated 9/1/2014 11:22:58 AM

2 Answers/Comments

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8

(x - 3) 2 = 5

2x - 6 = 5

2x = 5 + 6

2x = 11

x = 11 / 2

2x - 6 = 5

2x = 5 + 6

2x = 11

x = 11 / 2

Added 9/1/2014 11:20:36 AM

This answer has been confirmed as correct and helpful.

8

2x^2 + x = 15

2x^2 + x - 15 = 0

Factor the left side

(2x - 5)(x + 3) = 0

2x - 5 = 0 or x + 3 = 0

x = 5/2 or x = - 3

2x^2 + x - 15 = 0

Factor the left side

(2x - 5)(x + 3) = 0

2x - 5 = 0 or x + 3 = 0

x = 5/2 or x = - 3

Added 9/1/2014 11:22:56 AM

This answer has been confirmed as correct and helpful.

A circle has a diameter with endpoints of (-2, 8) and (6, 4). What is the center of the circle?
**Weegy:** Diameter=10.198
center=(2,6) **User:** Which of the following equations is of a parabola with a vertex at (1, 2)?
**Weegy:** The vertex of a parabola is the point where the parabola crosses its axis. If the coefficient of the x2 term is positive, the vertex will be the lowest point on the graph, the point at the bottom of the U -shape. [ If the coefficient of the x2 term is negative, the vertex will be the highest point on the graph, the point at the top of the U -shape.
The standard equation of a parabola is
y = ax2 + bx + c.
But the equation for a parabola can also be written in "vertex form":
y = a(x ? h)2 + k ] **User:** What is the solution set of 6x 2 - 24 = 0?
**Weegy:** 6x - 5 = -17 solution is x = -2. Click on the "Good" button. Thank you. **User:** What is the solution set of 6x 2 - 24 = 0?
**Weegy:** 6x - 5 = -17 solution is x = -2. Click on the "Good" button. Thank you. **User:** Which of the following constants can be added to x 2 - x to form a perfect square trinomial?
**Weegy:** The answer is 1/4.
Here, I'll show you how to get that answer:
Trial and Error Method:
1) 1/4, [ 1/2 and 1 are the possible answers in the choices but we know that 1/2 is not a perfect square so it's not possible for 1/2 to be the answer.
2) Now try 1/4 and 1 and add them to the equation to get:
x2 - x + 1/4
x2 - x + 1
3)Use the perfect square formula if you can:
x2 - x + 1/4 becomes (x-1/2)2? Yes!
x2 - x + 1 becomes (x-1)2 ...No! that's wrong because (a-b)2 = a2-2ab +b2
Thus, 1/4 is the answer.
Easy Formula Method:
1) In a perfect square trinomial, c = (b/2a)2.
a=1 because it's the co-efficient of x2
b=1 because it's the coefficient of x
c=? and it's the missing constant
using the formula and the given, c = 1/4.
That's it! :D Good Luck!
] **User:** Runners in a long distance race start out going 8 kilometers east and then head north for the remainder of the race. The finish line is 10 kilometers from the starting line. How far did the runners travel ... (More)

Question

Updated 6/27/2014 12:20:18 AM

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6x^2 - 24 = 0

6(x^2 - 4) = 0

6(x + 2)(x - 2) = 0

x = -2 or x = 2

6(x^2 - 4) = 0

6(x + 2)(x - 2) = 0

x = -2 or x = 2

Added 6/27/2014 12:18:39 AM

This answer has been confirmed as correct and helpful.

Confirmed by yumdrea [6/28/2014 3:19:22 PM]

Find the distance between the points (3, 8) and (-1, 9).
**Weegy:** distance formula
d^2= (x2-x1)^2 + (y2-y1)^2
d^2= (-1-3)^2 + (9-8)^2
d^2= (-4)^2 + (1)^2
d^2= 16+1
d^2= 17
d= 17 **User:** Write the quadratic equation in general form. What is the value of b 2 - 4ac?
1 = 2x 2 + 7x
**User:** Write the quadratic equation in general form. What is the value of b^2 - 4ac?
1 = 2x^2 + 7x
(More)

Question

Updated 5/25/2014 8:16:21 AM

2 Answers/Comments

The distance between the points (3, 8) and (-1, 9) is sqrt 17.

Added 5/25/2014 8:14:53 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [5/25/2014 8:43:10 AM]

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