exam Maths Puzzle Numerical Ability

log5+log(5x+1)=log(x=5)+1

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exam Other Question

What operation used in the algebraic expression xyz2? factorize-
a-12-(root)5x-30x^
b-6(root)7^+x-5(root)7
c-21+20x^+29(root)2x
d-90x^-7(root)6x-2

plz answer these questions....thankyou!!!