book Maths Puzzle Numerical Ability

how do i transform te equation y=x²+6x+3 into the the standard equation
y=a(x-h)²+k

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book Other Question

-10 + (+3)=
The answers are....7, -13, -7, 13.
Thank you for the help.
three consecutive integers are such that the first plus one half the second plus seven less than twice the third is 2101. What are the integers