It is of the 2nd degree.
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3x² - 4x + 9 is a polynomial of degree 2.
The degree of the polynomial.
The degree of a polynomial is the highest exponent on any independent variable in the polynomial.
The degree is the highest power of the variable that appears in it.(x2 + x + 9) is a second degree polynomial(Q4 - 72) is a fourth degree polynomial( z ) is a first degree monomialSo the degree of a polynomial in one variable is the highest power of the variable.For example, [ 2x3 - 7x ] has degree 3.The degree of a polynomial in two or more variables is the greatest sum of theexponents in any single term.For example, [ 5m3 + m2n - mn2 ] has degree 4.And a degree of a monomial is the sum of the exponents of its variables.For example, [ 4a2b3 ] has degree 5.
The Degree (for a polynomial with one variable) is the largest exponent of that variable.