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a) 3x³- 5x²+ 2x -8
putting the value of x= -2
3(-2)³ -5(-2)² +2(-2) -8
3*(-8) -20 -4 -8
-24 - 20 - 4 - 8
-56
b) sum of all angles = (360+900)°
= 1260°
no. of sides = 1260/180
= 7
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