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Use the discriminant to determine how many and what kind of solutions the quadratic equation [tex]$2x^2 - 4x = -2$[/tex] has.

A. Two complex (nonreal) solutions
B. No real or complex solutions
C. One real solution
D. Two real solutions


Sagot :

Let's start by solving the given quadratic equation [tex]\(2x^2 - 4x = -2\)[/tex]. First, we need to rewrite it in standard form, which is [tex]\(ax^2 + bx + c = 0\)[/tex].

Rearranging the equation, we get:
[tex]\[ 2x^2 - 4x + 2 = 0 \][/tex]

Here, the coefficients are [tex]\(a = 2\)[/tex], [tex]\(b = -4\)[/tex], and [tex]\(c = 2\)[/tex].

To determine the number and type of solutions for this quadratic equation, we use the discriminant (D), which is given by the formula:
[tex]\[ D = b^2 - 4ac \][/tex]

Substitute the values of [tex]\(a\)[/tex], [tex]\(b\)[/tex], and [tex]\(c\)[/tex] into the formula:
[tex]\[ D = (-4)^2 - 4 \cdot 2 \cdot 2 \][/tex]
[tex]\[ D = 16 - 16 \][/tex]
[tex]\[ D = 0 \][/tex]

The discriminant [tex]\(D\)[/tex] is 0.

The nature of the solutions of a quadratic equation can be determined based on the value of the discriminant:
- If [tex]\(D > 0\)[/tex], there are two distinct real solutions.
- If [tex]\(D = 0\)[/tex], there is exactly one real solution.
- If [tex]\(D < 0\)[/tex], there are two complex (nonreal) solutions.

Since the discriminant [tex]\(D = 0\)[/tex] in this case, the quadratic equation [tex]\(2x^2 - 4x + 2 = 0\)[/tex] has exactly one real solution.

Therefore, the answer is:
- one real solution