Question

s^2-2s-399=0 polynomial​

Answer 1

Answer:

$s = ( - 19) \: \: or \: \: \: s = 21$

Step-by-step explanation:

${s}^{2} - 2s - 399 = 0 \\ {s}^{2} + 19s - 21s - 399 = 0 \\ s(s+ 19) - 21(s + 19) = 0 \\ (s - 21)(s + 19) = 0$

So,

$either \: s - 21 = 0 \: \: or \: s + 19 = 0 \\ s = 21 \: or \: s = - 19$