exam Maths Puzzle Numerical Ability

Find the domain of the function
f(x)= 3
(x-1)(x-2)

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exam Other Question

Solve: 3x(to the 2nd power) - 2x - 4 = 0

Please show work and solution.
smith has 3 times as much money invested at 8% bonds as he has in stocks paying 9.5%. how much does he have invested in each if his yearly income from the investments is $6365 ?