exam Maths Puzzle Numerical Ability

Write expression in the form a = bi, where a and b are real numbers.

-3i(4i - 1)

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exam Other Question

what is the domain of functionf(x)=log8(5x=1) Luis is 10 years older than his brother. Next year, he will be three times as old as his brother. How old is Luis now and What will the brothers age be next year?