exam Maths Puzzle Numerical Ability

Help to simplify the following would be appreciated :

3i^3 + 5i - 3i^2 + the square root of -25 - 2

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exam Other Question

When factoring 2x2 + 4x + 6, the first step is:

find the factors of 6
find the factors of 2
take out the GCF
find the factors of 2 times 6 which add to give 4 why is the fraction as to be set apart from the others nunber when the fraction is part of the ecuation