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
Option D
∠1 = ∠8
Step-by-step explanation:
If two parallel lines are cuts by transversal ,then the alternate interior angles formed are congruent.
∠1 = ∠6 (since they are vertically opposite angles)
∠6=∠3 (Since alternate interior angles are congruent)
∠3=∠8 (since they are vertically opposite angles)
Therefore ∠1 = ∠8
Answer: 1,980
Step-by-step explanation:
1 is the answer b/c that's the only number it goes too
