Yes, -4x is a polynomial. A polynomial is an expression that consists of variables raised to non-negative integer powers, multiplied by coefficients. In this case, -4 is the coefficient and x is the variable raised to the first power, which meets the criteria for a polynomial. Thus, -4x is a linear polynomial.
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3x² - 4x + 9 is a polynomial of degree 2.
Yes. -4x is one, and 3y is one. They are combined with a "+" sign, and together they are a polynomial.
See definition of polynomial and monomials. You will see.
4x(4x^2 + 3x + 1)
It is of the 2nd degree.