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

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

Step-by-step 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 =

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.

1) c 2143.6 cm

2) c 113.0 m

3) a 33.5 ft

4)   d 2 cm

5) c 20 mm

6) 180 in

7) d 120 ft

answer is because 4×10=40

and 98×4= is 392

40,392