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Statement: When (D=0), roots are equal. What type of statement is this?

Answer and explanation

Correct answer: True

The direct answer is A: the statement is true. For a quadratic equation written as ax^2+bx+c=0, where a is not zero, the discriminant is D=b^2-4ac. The roots are given by x=(-b plus or minus square root of D)/(2a). When D=0, square root of D is 0, so both signs give the same value, x=-b/(2a). Therefore the two roots are real and equal. Option A is correct. Option B is wrong because the statement is a standard true rule. Option C is wrong because a=0 would remove the quadratic term, so the equation would not be a quadratic equation. Option D is wrong because c=0 is not required; it only makes one root zero in some cases. Exam cue: D=0 means equal roots.

Related tags

Quadratic EquationsTrue FalseD Zero

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