Answer:
2r
Step-by-step explanation:
r+3r+_=6r
4r+_=6r
Subtract 4r from both sides.
_=2r
Therefore the answer is 2r.
Answer:
12/18
Step-by-step explanation:
The discontinuity occurs when the denominator is equal to zero, as it has "infinite" slope, and thus is not a real value or point.
x^2+x-12
x^2+4x-3x-12
x(x+4)-3(x+4)
(x-3)(x+4)
So discontinuities occur when x=-4 and x=3