exam Maths Puzzle Numerical Ability

I need help solving, -2square root of 5 +5 square root of 5 -3 square root of 5

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exam Other Question

For the following set, which number has the largest absolute value? Show work
4,-1,12,-20,19,0

A) 0
B) 19
C) -20
D) -1 Find the exact solution to the equation 3^x+5=9^x.