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Susie is solving the quadratic​

Susie is solving the quadratic​-example-1
User Sqqqrly
by
8.6k points

1 Answer

5 votes

Answer:

Option (D)

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 =
(-b\pm √(b^2-4ac) )/(2a)

=
(-(-4)\pm √((-4)^2-4(2)(-3)) )/(2(2))

=
(4\pm√(16+24))/(4)

=
(-4\pm √(40))/(4)

=
(-2\pm √(10))/(2)

Therefore, Susie made a mistake in step IV.

Option (D) is the answer.

User Dejay
by
8.8k points

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