exam Maths Puzzle Numerical Ability

Problem #1
Sqare root of 150x to the 4th power
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Sqare root of 3x

Problem #2
Square root of 200x to the 3rd power
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exam Other Question
the sum of the solutions to 49x^2-25 is? thank you they are problem that are monomial and polynomial..

(72x^5y^8Z^5)/-12x*y^2z^3

(5x*y^4)^2(-x*y^4)^3

(-15y^3+15y^2+45y)/(-15y)

(3x+1)(3x-1)

(x^2+9)(x^2-9)

(-2a^2-5a