The number of positive roots is the number of changes of signs there are, then decrease by 2 each time and stop when you get to 1 or 0
negative roots, sub every x with -x and reevaluate, count change of signs
decrease by 2 each time and stop when you get to 1 or 0
y=+2x⁵-x⁴-2x³+4x²+x-2
+,-,-,+,+,-
1 2 3
3 or 1 positive roots
replace x with -x ( baically flip all signs of odd powerd numbers)
y=-2x⁵-x⁴+2x³+4x²-x-2
-,-,+,+,-,-
1 2
2 or 0 negative roots
3 or 1 positive roots
2 or 0 negative roots
2nd option is answer
Alex has 128 baseball cards, Leo has 66 cards, and ginny has 210.
ABCDEFGHIJKLMNOPQRSTUVWXYZ?
It's be a line that crosses the y-axis at (0,7) and has a slope of -3 or -3/1.
The factors of 27 are 1, 3, 9, and 27 .
A prime number has only two factors. They are ' 1 ' and itself.
27 has four factors, so it's not prime.
