book Maths Puzzle Numerical Ability

Algebraic expression {{{bx^2-cx+a^2=0}}} the differ by the sign of the square root. what is the one with the plus sign?

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book Other Question

A student thinks that the expression (a+b)2 and a2+b2 are equal to one another. How would you explain to the student why this is not so? If a number is subtracted from its square, the result is 2. Find the number.

The length of a rectangle is 4 cm longer than the width. If the perimeter of the rectangle is 20 cm what is the area? Area=___cm^2
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