Question

Susie is solving the quadratic​

Answer 1

Answer:

Option (D)

Step-by-step explanation:

Standard equation of a quadratic function is,

ax² + bx + c

Comparing this function with the given quadratic function,

f(x) = 2x² - 4x - 3

a = 2, b = -4 and c = -3

By using quadratic formula to get the value of x,

x = $\frac{-b\pm \sqrt{b^2-4ac} }{2a}$

  = $\frac{-(-4)\pm \sqrt{(-4)^2-4(2)(-3)} }{2(2)}$

  = $\frac{4\pm\sqrt{16+24}}{4}$

  = $\frac{-4\pm \sqrt{40}}{4}$

  = $\frac{-2\pm \sqrt{10}}{2}$

Therefore, Susie made a mistake in step IV.

Option (D) is the answer.