Question

if ax2 + bx + c = 0 has equal roots then the value of b is​

Answer 1

Answer:

$a {x}^{2} + bx + c = 0 \: has \: equal \: roots \: \\ therefore \: \: \: {b}^{2} - 4ac = 0 \\ or \: {b}^{2} = 4ac \\ or \: b \: = 2 \sqrt{ac}$

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Answer 2

Answer:

ax² + bx + c = 0 has equal root.

then,

b² - 4ac = 0

b² = 4ac

b = √4ac

= 2√ac