there are 5 question please answer each with reason urgent it is
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i) (d) None of these
ii) (b) 7x³ -16x² -1
iii) (b) 2m + 5
iv) (a) -11b +17c
v) (d) None of these
Step-by-step explanation:
i) (2x+3y+z)- (x+2y-z)
=2x+3y+z -x -2y +z
=x+y+2z
ii)(8x^3 -5x^2 +3)- (x^3 +11x^2+4)
= 8x^3 -5x^2 +3- x^3 -11x^2-4
=7x^3 - 16x^2 - 1 => b)
iii)Perimeter = sum of all sides
∴one side = Perimeter - (sum of 2 sides)
= (7m+8) - (3m+2+2m+1)
= (7m+8) - (5m +3)
= 7m + 8 -5m -3
= 2m +5 => b)
iv) a - 8b + 4c +2a -3b +7c -3a +6c
=-11b +17c => a)
v) 3l -2m +5n -6l +2m +4n - l -4m -8n
= -4l -4m +n => d)
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