book Maths Puzzle Numerical Ability

Solve by completing the square:
x^2+8x+13=0

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book Other Question

A total of 10 pounds of apples and grapes costs $12.30. The apples cost $1.29 per pound and the grapes costs $1.19 per pound. How many pounds of apples are there? A vending machine has $41.25 in it. There are 255 coins total and the machine only accepts nickels, dimes and quarters. There are twice as many dimes and nickels. How many of each coin are in the machine?