book Maths Puzzle Numerical Ability

(1/2x^2 - 3/4x + 1/5) - (1/4x^2 - 1/2x + 1/10)

(1/2x +1/3) (1/2x -1/4)

(12y3 + 18y2 + 24y) � (6y)

(3x2 + 11x - 4) � (3x - 1)

(2x3 - 9x2 + 11x - 3) � (2x - 3)

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book Other Question

I need help on how to get the answer to this equation: Y=(2x�2 + 4x + 1)�5

and the answer they gave was y= 20(2x +4x +1)�4(x+1), do you think there was a typo somewhere?? Write 3,300,000 in scientific notation.