exam Maths Puzzle Numerical Ability

Can you please help me by completing the square?
2x^2-4x-3=0

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exam Other Question

Kelly has 36 coins in her purse, only nickels and quarters. She has eight more quarters than nickels. If she has a total of $6.20, how many nickels and quarters does she have? Can you please help me on this? Thanks I have no clue how to do it.

Find the missing coordinate to complete the ordered-pair solution to the given linear equation....

y=6x+5
(a) (0, )
(b) (3, )