Quadratic form is a shorthand term generally used to say to put an equation in the form ax2 + bx + c .
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It is, as stated, 2x2 + x - 1 = 0. That is the quadratic form.
No, it is not.
None, if the coefficients of the quadratic are in their lowest form.
Put the quadratic equation into standard form; identify the coefficients (a, b, c), replace them in the equation, do the calculations.
The quadratic equation, in its standard form is: ax2 + bx + c = 0 where a, b and c are constants and a is not zero.