Answer:
go to the link
Step-by-step explanation:
https://answers.yahoo.com/question/index?qid=20070620063730AAaJuXa
or
These questions are SOOO easy, but I just don't have a clue. (don't even know if they technically are algebra they are that easy).
x² - 8x - 20 =
(x+10) (x-2)
Thats what I got for that answer (lucky guess) but how do you know which side each sign goes on.. ie (x+10)(x-2) or (x+2) (x-10)??
Same problem with this question...
(x-6) (x-5) =
x² - 11x + 30
Answer:
There is no explanation to this, idk how to answer this for you.
Step-by-step explanation:
Answer:
Step-by-step explanation:
First, find the LCM and multiply through:
The LCM will cancel out the denominators (note that braket symbolizes Multiplication):
:3(2x-1) +4(x)=24
:6x-3+4x=24
Group like terms:
6x+4x=24+3
10x=27
Divide through by 10 to eliminate the coefficient of x
: x=
We turn -5,12 into polar coordinates. It's a Pythagorean Triple so
r = 13 Ф=arctan(-12/5) + 180° ( in the second quadrant )
so -5 = 13 cos Ф, 12 = 13 sin Ф
12 sin x - 5 cos x = 6.5
13 sinФ sin x + 13 cos Ф cos x = 6.5
13 cos(x - Ф) = 6.5
cos(x - Ф) = 1/2
cos(x - Ф) = cos 60°
x - Ф = ± 60° + 360° k integer k
x = Ф ± 60° + 360° k
x = 180° + arctan(-12/5) ± 60° + 360° k
That's the exact answer;
x ≈ 180° - 67.38° ± 60° + 360° k
x ≈ 122.62° ± 60° + 360° k
x ≈ { 62.62°, 182.62°} + 360° k, integer k