exam Maths Puzzle Numerical Ability

complete the factorizaTION OF EACH BINOMIAL
A TO THE SECOND POWER - A = -A( )

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exam Other Question

a race boat covers a distance of 66 km. downstream in 110 minutes. it covers distance upstream in 120 minutes the speed of the boat in still water is 34.5 km/h find the speed of t PLEASE HELP:
Write 3-{-36 in standard form (they dont have the symbol for what i needed which was in the shape of a divisional sign so i used {