exam Maths Puzzle Numerical Ability

(10+(square root 20))-(4-(square root 45))
I got 12+2(square root 20)-2(square root 45)
Am I even close?

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exam Other Question

(x-2)divided (2-x) A. Create matrix A such that a11=4, a12=6, a21=0, and a22=-1.
B. What is the additive inverse of A?

p.s. a11= an a with the 11 written like the opposite of a^11