Question

one zero of the quadratic polynomial x² + 3x + k is 2, then the value of k is *
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Answer 1

Keep the value of x as 2

Then,

2² + 3 * 2 + k +2 = 0

4 + 6 + k + 2 = 0

12 + k = 0

k = -12

Hopefully (˘･_･˘)

Answer 2

Answer:

$let \: \: other \: \: zero \: \: be \: \: \beta \\ and \: \: \gamma = 2 \\ \beta + \gamma = - \frac{b}{a} \: \: where \: \: b = 3 \: \: and \: \: a = 1 \\ \beta + 2 = - 3 \\ \beta = - 5 \\ now \: \: \: \beta \times \gamma = \frac{c}{a} \: \: where \: \: c = k \: \: and \: \: a = 1 \\ k = - 10 \: \: \: \: ans.$

hope it will help you.