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Solving a Quadratic Equation by Factorization Method

Find the valu...

Question

Find the value of a + b, if 1 is a root of the equation $a x^{2} + b x + 1$ = 0

A

1

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B

-1

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C

0

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D

2

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Solution

The correct option is B
-1

1 is a root
$\Rightarrow a$ x $1^{2}$ +b x $1 + 1$ = 0
a + b + 1 = 0
or
a + b = -1

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