Which of the following is a situation in which an equation can not be solved using the quadratic formula

Complete question is

Which of the following is a situation in which an equation cannot be solved using the quadratic formula? (a) The coefficient of the x^2-term is 1.

(b) The right-hand side of the equation is zero.

(c) One term of the polynomial has a degree of 3.

(d) The coefficient of the x-term is zero.

Answer:

(a) The coefficient of the x^2-term is 1 = > we can use quadratic formula for any coefficient of x^2 term.

(b) The right-hand side of the equation is zero. = > we can apply quadratic formula only when the right side of the equation = 0

(c) One term of the polynomial has a degree of 3. = > the highest degree of quadratic equation is 2. So we cannot apply quadratic formula for polynomial that has degree 3.

(d) The coefficient of the x-term is zero = > we can apply quadratic formula but x^2 term should be there. 0 in x term does not affect the formula.

So answer is C