Question

s2 + 10s + 21 = 0

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Answer 1

Step-by-step explanation:

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Answer 2

Answer:

$\tt {s}^{2} + 10s + 21 = 0 \\ \tt \: {s}^{2} + 3s + 7s + 21 = 0 \\ \tt s(s + 3) + 7(s + 3) = 0 \\ \tt (s + 7)(s + 3) = 0 \\ \red{\overbrace{ \overline{\underbrace{\underline{\orange{ \tt \: s = - 3 \: or \: s = - 7}}}}}}$

Correct Answer:-

• s=-3 or s=-7