book Maths Puzzle Numerical Ability

Use the method of "completing the square" to solve the following quadratic equations:

{{{2x^2-7x-4=0}}}

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Write the equation of the line in both forms:

horizontal line that goes through (3,7)
The side of a square, AB and AD, are extended 14cm and 10cm respectively, to form sides AE and AF of a rectangle. If the perimeter of the rectangle is at least twice the perimeter of the square, at most how long is a side of the square?