exam Maths Puzzle Numerical Ability

A boy is 4 years old and his sister is three times as old as he is. When the boy is 12
years old, how old will his sister be?

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exam Other Question

find two imaginary numbers in the form a + bi whose product = 17. Neither a nor b may equal zero.

Has me stumped. Any help is appreciated.
Can you help me to solve these
1. Find all zeros, both real and complex, of f(x)=x3-8x2 + 25x - 26 (3 and 2 are exponent) and write the polynomial in factored form.