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  2. Completing the square - Wikipedia

    en.wikipedia.org/wiki/Completing_the_square

    The square of a real expression is always greater than or equal to zero, which gives the stated bound; and here we achieve 2 just when x is 1, causing the square to vanish. Example: factoring a simple quartic polynomial

  3. Least-upper-bound property - Wikipedia

    en.wikipedia.org/wiki/Least-upper-bound_property

    A real number x is called an upper bound for S if x ≥ s for all s ∈ S. A real number x is the least upper bound (or supremum) for S if x is an upper bound for S and x ≤ y for every upper bound y of S. The least-upper-bound property states that any non-empty set of real numbers that has an upper bound must have a least upper bound in real ...

  4. Real property - Wikipedia

    en.wikipedia.org/wiki/Real_property

    In English common law, real property, real estate, immovable property or, solely in the US and Canada, realty, refers to parcels of land and any associated structures which are the property of a person. For a structure (also called an improvement or fixture) to be considered part of the real property, it must be integrated with or affixed to ...

  5. Quadratic equation - Wikipedia

    en.wikipedia.org/wiki/Quadratic_equation

    This "completes the square", converting the left side into a perfect square. Write the left side as a square and simplify the right side if necessary. Produce two linear equations by equating the square root of the left side with the positive and negative square roots of the right side. Solve each of the two linear equations.

  6. Real estate - Wikipedia

    en.wikipedia.org/wiki/Real_estate

    Real estate is property consisting of land and the buildings on it, along with its natural resources such as growing crops (e.g. timber), minerals or water, and wild animals; immovable property of this nature; an interest vested in this (also) an item of real property, (more generally) buildings or housing in general.

  7. Complex number - Wikipedia

    en.wikipedia.org/wiki/Complex_number

    For example, the equation (+) = has no real solution, because the square of a real number cannot be negative, but has the two nonreal complex solutions + and . Addition, subtraction and multiplication of complex numbers can be naturally defined by using the rule i 2 = − 1 {\displaystyle i^{2}=-1} along with the associative , commutative , and ...

  8. Real estate appraisal - Wikipedia

    en.wikipedia.org/wiki/Real_estate_appraisal

    Real estate appraisal, property valuation or land valuation is the process of assessing the value of real property (usually market value). Real estate transactions often require appraisals because every property has unique characteristics. The location also plays a key role in valuation.

  9. Difference of two squares - Wikipedia

    en.wikipedia.org/wiki/Difference_of_two_squares

    Another geometric proof proceeds as follows: We start with the figure shown in the first diagram below, a large square with a smaller square removed from it. The side of the entire square is a, and the side of the small removed square is b. The area of the shaded region is . A cut is made, splitting the region into two rectangular pieces, as ...