# Take away:</p

(i)

= x3 - x2 + x + – (x2 - x3 + + x)

= x3 + x3 - x2 - x2 + x - x + -

= x3 - x2 - -

= x3 - x2 - -

(ii)

= a3 a2 – (a2 + a2 +

= a5 - a3 - a2 - a2 - - +

= (2a3 – 9a3) – (3a2 – 10a2) – +

= a3 - a2 - -

(iii)

= - - x2 – (x3 + x2 + x + )

= x3 - x2 - x2 - - + -

= x3 - x2- +

= x3 - x2 - – 1

(iv)

= - y2 – (y3 + y2 + y + )

= y3 - y2 - y2 - + -

= y3 + (-5y2 – 7y2) - y +

= y3 - y2 - y -

(v)

= ab - ac - bc – (ac - ab + )

= ab - ab - ac - ac - bc - bc

= - -

= ab - ac - bc

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