Methodofcompletingsquare is often used when transforming a quadratic form into a normal one, whose process is equivalent to making the relevant matrix contract diagonal.
The extremal formula of binary quadratic functions is studied by using methodof undetermined coefficients, substitution method and methodofcompleting the square.
用特定系数法、换元法、配方法探求二元二次函数的极值公式。
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A new methodofcompleting the square with reverse order is presented by change quadric form into standard form.