exam Maths Puzzle Numerical Ability

i have been working on the problem and not figuring out where they got there answer if someone could explain it to me...... (3x+7)exponent of 2 outside of ()

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exam Other Question

Determine the slope of the line that passes through each pair of points. If the slope is undefined, write "no slope".
(-8, 7) and (5, -2) I really need help to solve the following

-k(-2-3) - (-2)(-k-5) = -2-(-2k+4) + 3 times the square root of -27