Question

Which of the following cannot be solved using the quadratic formula?

Answer 1

Equation -3x² - x + 3 = -3x² can not be solved using quadratic formula.

Explanation:

1. -3x² - x + 3 = -3x²

Simplify above equation,

-3x² + 3x² - x + 3 = 0

or -x + 3 = 0 , Sine x² terms cancelled each other.

Hence this equation can not be solved using quadratic formula.

2. 0 =x² , yes here we can use quadratic formula

3. 0 = 2x²-1

Simplifying the above equation,

0 = 2x² - 1

1 = 2x²

x² =
`(1)/(2)`

Hence we can use quadratic formula here.

4. x²+3x-2 = 4x²- 5x - 1

Simplifying given equation,

x²+3x-2 = 4x²- 5x - 1

or x² - 4x² +3x +5x -2 + 1 = 0

or -3x² + 8x - 1 = 0

since x² term is here, hence we can solve this using quadratic formula.