book Maths Puzzle Numerical Ability

value of 4 to the second power + 2/3

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book Other Question

What is -8r - 7 = -24 using the foil method find the product.(x+3)(x2-2x+6)
then i got x3+-6x2+-36x+18 as my answer but my book got x3+x2+18
can u show me how they got that answer or what i did wrong