A quadratic. For example,
x^2 + 3x - 7xy - 12y - 25 = 0
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The quadratic formula can be used to solve an equation only if the highest degree in the equation is 2.
A non-linear equation is any equation which includes variables with a degree other than one. Therefore, any equation involving x2, x3, x4, .... would be non-linear. For example: y= 3x+2 is linear, because x and y are both degree 1 (no exponent) y= 2x2 is non-linear, because x is degree 2.
2
Oh, dude, it's like this: all quadratic equations are polynomials, but not all polynomials are quadratic equations. A quadratic equation is a specific type of polynomial that has a degree of 2, meaning it has a highest power of x^2. So, like, all squares are rectangles, but not all rectangles are squares, you know what I mean?
True Yes. Although the term 'quad' stands for four, a quadratic equation is a polynomial of second degree.