book Maths Puzzle Numerical Ability

looking for help
Factor
t^2+25 this is N,F or can it be factored
thank you for your time

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book Other Question

I could not find an appropriate title, this was the closest one. Sorry.

I have to multiply and simplify two sets of radicands.

(radicand 3x- radicand5x)(radicand2x+radicand5 please help me solve this question 3x^0 divided by y^-3