exam Maths Puzzle Numerical Ability

Factor completely x^3 + 6x^2 + 5x I thought i had it and realize that i didnt. Help please..

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exam Other Question

Please help me find all rational numbers for which the rational expression is not defined. x^2+x+105 over 5x-45. 1/r=1/s+1/t....solve for s

w=a^2/t.....solve for t

thanks