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Mathematics,, i need a good grade. thanks.?
1- Solve the quadratic equation 25x2 - 30x = -9 by factoring.
- x=3/5
- x=5/3
- x= -5/3
- x= -3/5
2- Simplify √25/144. Leave answer in fraction form.
- √5/44
- 12/5
- √25/12
- 5/12
3- Simplify √9/24
- 3/64
- 3/8
- 3/32
- ½
4- Simplify 27 -2/3
- 1/9
- 9
- 54
- 3
5- Solve by completing the square 3x2 - 8x -6 = 0.
- (-4±√34)/3
- (4±√34)/3
- -4±2√34
- 4±2√34
6- Solve by completing the square 4x2 +2x - 1 = 0.
- 1±√5
- (-1±√5)/4
- -1±2√5
- (-1±2√5)4
7- Find all the rational zeros of g(x) = 2x3 - 11x2 + 8x + 21.
- -1, 3, 7
- ±1, ±3, ±7/2
- -1, 3
- -1, 3, 7/2
5 Answers
- VinzLv 51 decade agoFavorite Answer
1. 25x^2 - 30x + 9 = 0
That factorises into:
(5x - 3)(5x - 3) = 0
5x - 3 = 0
5x = 3
x = 3/5
2. √25/144 or √25/√144
= 5/12
3. √9/24 or √9/√24
= 3/√24
None of the options you've given.
4. 27 - 2/3
27/1 - 2/3
Make denominator same (3)
81/3 - 2/3
= 79/3
- 26.333333333333333
None of the options you've given.
Dunno rest.
- JoLv 41 decade ago
1) x=3/5
2 if the sqrt sign is over the whole fraction it is 5/12
3) 3/24 = 1/8 (again ambiguity over the sgrt sign)
4) 27 = 81/3
81 /3 - 2/3 = 79/3
- 1 decade ago
Remember by doing this your not getting the good grade, I am.
1) 3/5
2) 5/12
3) I see no answer
4) I see no answer
5) +-sqrt(34) +-4/3
6 +-sqrt(5)+-1/4
7) -1,3,7
- Anonymous1 decade ago
Just tell you teacher you don't understand?
They should be happy to help
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