Respuesta :
Answer:
Step-by-step explanation:
(a+b)²=a²+2ab+b²
9x²+30x+ca
=(3x)²+2×3x×5+c
=(3x)²+2×3x×5+5²-5²+c
=(3x+5)²-25+c
it is a perfect square if -25+c=0
or c=25
Answer:
It is a vertical line
Step-by-step explanation:
A line with only x = 2 shows that the y values are countless. Y would go from 0 to infinity in either direction.
A horizontal line would have several x values and only 1 y value.
It can't pass through 0,2 since x =2 not 0
It also can't pass through the origin of 0,0 since it has only an x value.