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When you have 4 terms

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DOS
Perfect squares

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A set of whole numbers is the largest integer which divides them all.

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basically a method to split the middle term bx into 2 separate terms so that you can eventually factor the trinomial using grouping.

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There are two main situations. One where the constant is positive, and one when the constant is negative.

Consider a polynomial expression of the form ax ² + bx + c or ax ² + bx - c

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Factoring quadratics by grouping.

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The different of two square is a squared number subtracted from another square number.

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The largest positive integer that divides each of the integers.

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The AC method or factoring by grouping is a technique used to factor trinomial. Trinomial is a mathematical expression that consists of three terms(ax^2+bx+c).

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Group terms with common factors before factoring , this is done by a pair of terms.Then factor each pair of two terms.

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Multiplying ac in a trinomial,then using the factor of ac those sum is b,that allows us to rewrite the linear term of the polynomial as a sum of two linear terms.This also work when a=1 and when factoring difference of two squares.

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a^2-b^2=(a+b)(a-b)

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largest positive integer that divides evenly into all numbers .

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ax² + bx + c for example  6x²+1x-12

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ax ² + bx + c or ax ² + bx - c

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the grouping technique with 4 term polynomials

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The largest positive integer that divides each of the integers.

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group all the numbers of an exercise