exam Maths Puzzle Numerical Ability

When simplifying a radical, is it necessary to take the absolute value of a result to indicate the pricipal root?

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exam Other Question

find the values of each polynomial for the given values of the variable

x=-3
x=-2

-x^2-5x-6
What is the distributive property to write an equivalent variable expression.

( 5 - a )( -7 )