exam Maths Puzzle Numerical Ability

factor out GCF 4x+8 I dont understand this problem

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exam Other Question

5^(2x+1)=1/125 Hi! Could someone please help me with these problems. I need to simplify and all exponents should be positive.

(x+4)^2

(x+5y)(x-5y)

(x^3+7x^2+7x-15)/(x+3)

Thanks so much for your help!