exam Maths Puzzle Numerical Ability

Simplify: (x^4 + 10x^3 - 23x - 348x - 540) / (x + 5)

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exam Other Question

f(x)=2x
g(x)=x2
find the domain of each combination: a.(f+g)(x) b.(f-g)(x)
c.(fg)(x) d.(f/g)(x)
? if you have 4 with a small 4 upper right...do you multiply?
example number two : 5^4 x 3^2 is ???? every way I work them it is some huge number as an answer and I do not know what I am doing wrong
help....