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A digital textbook is a digital book or e-book intended to serve as the text for a class. Digital textbooks may also be known as e-textbooks or e-texts.Digital textbooks are a major component of technology-based education reform.
The apparent plural form in English goes back to the Latin neuter plural mathematica , based on the Greek plural ta mathēmatiká (τὰ μαθηματικά) and means roughly "all things mathematical", although it is plausible that English borrowed only the adjective mathematic(al) and formed the noun mathematics anew, after the pattern of ...
() = () is called the factored form, where r 1 and r 2 are the roots of the quadratic function and the solutions of the corresponding quadratic equation. f ( x ) = a ( x − h ) 2 + k {\displaystyle f(x)=a(x-h)^{2}+k} is called the vertex form , where h and k are the x and y coordinates of the vertex, respectively.