exam Maths Puzzle Numerical Ability

find domain and range

f(x)=2-square root xsquared+3x+2divided by x squared+5x+4

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exam Other Question

Genetic problems, dihybrid crosses:
In flowering peas, a gene for tall plants(T) is dominant over its allele for short plants(t). The gene for smooth peas(S) is dominant over its
(10+(square root 20))-(4-(square root 45))
I got 12+2(square root 20)-2(square root 45)
Am I even close?