what is quadratic
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In algebra, a quadratic equation is any equation that can be rearranged in standard form as ax^{2}+bx+c=0 where x represents an unknown, and a, b, and c represent known numbers, where a ≠ 0. If a = 0, then the equation is linear, not quadratic, as there is no ax^2 term.
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Those tissues that are made up of structurally different types of cells that are involved in the related functions are called complex tissues. Xylem and phloem are the complex tissues. Xylem is made up of vessels, tracheids, xylem parenchyma, and xylem fibers.
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