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Evaluate the expression for the given value of the variable(s). -x2 - 4x; x = –3 A. 3 B. –1 C. 11 D. –17
Weegy: -x^2 - 4x= A. 3 when x= -3 User: Combine like terms. What is a simpler form of the expression? -3(-4y + 3) + 7y A. 19y - 9 B. 10y C. -19y + 3 D. -19y - 9 Weegy: The answer for -3(-4y + 3) + 7y is 19y - 9. (More)
Question
Expert Answered
Asked 1/21/2013 12:34:57 PM
0 Answers/Comments
What is the expression in factored form? x2 + 14x + 48 A. (x + 6)(x - 8) B. (x + 8)(x - 6) C. (x - 8)(x - 6) D. (x + 6)(x + 8)
Weegy: D. (x + 6)(x + 8) is the answer. User: Simplify the expression. (3 + i) - (2 - 2i) A. 1 + 3i B. 5 - i C. 4i D. -1 - 3i Weegy: B. 5 - i User: The function y = 16t2 + 486 models the height y in feet of a stone t seconds after it is dropped from the edge of a vertical cliff. How long will it take the stone to hit the ground? Round to the nearest hundredth of a second. A. 7.79 seconds B. 11.02 seconds C. 0.25 seconds D. 5.51 seconds Weegy: The answer is 5.51 seconds User: What is the expression in factored form? 16x2 - 25 A. (4x - 5)2 B. (4x + 5)(-4x - 5) C. (4x + 5)(4x - 5) D. (-4x + 5)(4x - 5) User: What value completes the square for the expression? x2 - 18x A. 9 B. -9 C. 81 D. -81 Weegy: C. 81 completes the square for the expression. User: What is the expression in factored form? 9x2 - 12x + 4 A. (-3x - 2)2 B. (-3x + 2)(3x - 2) C. (3x - 2)2 D. (3x + 2)2 Weegy: C. (3x - 2)2. I assume you mean 9x^2 - 12x + 4. User: The function h = -t2 + 95 models the path of a ball thrown by a boy where h represents height, in feet, and t represents the time, in seconds, that the ball is in the air. Assuming the boy lives at sea level where h = 0 ft, which is a likely place the boy could have been standing when he threw this ball? A. his backyard B. an underground cave C. a ladder D. a bridge Weegy: B. an underground cave. He is currently situated below sea level. Source: User: Solve the equation. x2 + 18x + 81 = 25 A. 14, 4 B. –4, –14 C. 14, –14 D. –4, 4 Weegy: C. 81 completes the square for the expression. User: What is the equation, in standard form, of a parabola that models the values in the table? x -2 0 4 f(x) -7 3 -73 A. y = -3x2 - 3x + 4 B. y = 4x2 + 3x - 3 C. y = -4x2 - 3x + 3 D. y = -3x2 - 4x + 3 Weegy: D. y = -3x^2 - 4x + 3 is the answer. User: Use the Quadratic Formula to solve the equation. -2x2 - 5x + 5 = 0 Weegy: 0. A. User: What is the fourth term of (d + ... (More)
Question
Not Answered
Updated 6/3/2014 11:18:48 PM
5 Answers/Comments
(3 + i) - (2 - 2i)
= 3 + i - 2 + 2i
= 1 + 3i
Added 6/3/2014 11:05:48 PM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by yumdrea [6/3/2014 11:09:50 PM]
x^2 + 18x + 81 = 25
x^2 + 18x + 81 - 25 = 0
x^2 + 18x + 56 = 0
(x + 4)(x + 14) = 0
x = -4 or x = -14
Added 6/3/2014 11:07:05 PM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by yumdrea [6/3/2014 11:09:27 PM]
[Deleted]
Added 6/3/2014 11:08:49 PM
Deleted by yeswey [6/3/2014 11:09:19 PM], Confirmed by yumdrea [6/3/2014 11:10:13 PM], Deleted by yeswey [6/3/2014 11:19:15 PM]
-x^3 + 5x^2 - 11x + 55 = 0
-x^2(x - 5) - 11(x - 5) = 0
(x - 5)(-x^2 - 11) = 0
x - 5 = 0 or -x^2 - 11 = 0
x = 5 or x = ± (sqrt 11)i
Added 6/3/2014 11:11:12 PM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by andrewpallarca [6/4/2014 12:58:23 PM]
x^3 - 2x^2 + 10x + 136 = 0
(x + 4)(x^2 - 6x + 34) = 0
x + 4 = 0 or x^2 - 6x + 34 = 0
When x + 4 = 0, x = -4
When x^2 - 6x + 34 = 0
x = [6 ± sqrt (-100)]/2 = (6 ± 10i)/2 = 3 ± 5i
The solution is {-4, 3 + 5i, 3 - 5i)
Added 6/3/2014 11:18:48 PM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by andrewpallarca [6/4/2014 12:58:51 PM]
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