exam Maths Puzzle Numerical Ability

A 598M^2 SUBURBAN BLOCK OF LAND WAS ADVERTISED FOR SALE AT $39000.00, WHILE AN EQUALLY WELL SITUATED BLOCK OF LAND 980^2 WAS PRICED AT $64000.00. WHICH WAS THE BETTER VALUE FOR MON

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Factor Completely. y^4 + 3y^3 -5y^2 -15y

I am struggling with this problem and need some assistance with this. Thanks change -sqrt3 + i in trigonometric form and find

1. (-sqrt3+i)^5, answer in rectangular form such as a+bi?

2. (-sqrt3 + i)^1/3, write all answers separately in trigonometric form using degree angles?