exam Maths Puzzle Numerical Ability

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

I am struggling with this problem and need some assistance with this. Thanks

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exam Other Question

find a polynomial with leading coefficent 1 and degree 3 that has -1,11, and 3 as roots Solve for x:
a) (4^x)(2^(x+3)=16(^2x-5)
b) (2x-1)(^1/2)=sqrt3
c) 8(^2x)+(8^x)-12=0
d) (x+3)(^2/3)=4