exam Maths Puzzle Numerical Ability

i dont realli no how 2 word this...but wats it mean if theres an exponent before a sq. root (not after)...u multiply the sq. root by the exponent?

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exam Other Question
I need to know that the symbol ^ means. The math problem is 3^2*(6-4)+8. Explain (a+b)^2 not equal to a^2 + b^2

give a numerial example to illustrate