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Which of the following equations has only one solution? A. x^2 + 4x + 4 = 0 B. x^2 + x = 0 C. x^2 - 1 = 0

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mendezs9118

Answer

A. is the answer

Step-by-step explanation:

Determine the number of solutions using the discriminant D=b^2-4 ac

D=4^-4 x 1 x 4

simplify the expression

D= 4^2-4 x 1 x 4

which is

D=0

since D=0, the quadratic equation has 1 real solution

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