. A Q.5 Atomic numbers of the following elements are given below: A = 8; B = 7; C = 17; D = 11; E = 20 1. State which of the above is a divalent metal. 2 State which of the above is a non-metal. 3 State the type of bonding between two atoms of 'A'. 4 State the type of bonding between 'D' & 'C'. State the number of covalent bonds formed in a molecule of 'B^2.
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2y^3+y^2-2y-1
let p(y) = 2y^3+y^22y^3+y^2-2y-1
By trial,we find that
p(1)=2(1)^3+(1)^2-2(1)-1
= 2 + 1 - 2 -1=0
By factor theorem,(y -1)is a factor of p(y)
Now
2y^3+y^22y^3+y^2-2y-1
= 2x^2(y-1) +3y(y-1)+1(y-1)
= (y-1) (2y^2+3y+1)
= (y-1) (2y^2+2y+1)
= (y-1) (2y(y+1) +1 (y+1))
= (y-1) (y+1) (2y+1).
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