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The discriminant of the equation $x^2 - 4x + 4 = 0$ is

A16
B0
C32
D-16
Answer & Solution
Correct answer: B. 0
1. Here $a=1$, $b=-4$, $c=4$. 2. $D=b^2-4ac=(-4)^2-4(1)(4)=16-16$. 3. $=0$, so the roots are real and equal. _Source: Karnataka SSLC (KSEEB) Class 10 Mathematics, Ch10 'Quadratic Equations', §10.4_
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