Question

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Answer 1

Answer:

$x = - 8 \: or \: x = - 5$

Step-by-step explanation:

$f(x) = - {7x}^{2} - 91x - 280$

$- {7x}^{2} −91x−280=0$

$- {7x}^{2} −91x−280=0$

$−7( {x}^{2} +13x+40)=0$

$x + 5 = 0$

$x + 8 = 0$

$x + 5 = 0$

$x = - 5$

$x + 8 = 0$

$x = - 8$

Hope it is helpful....

Answer 2

Answer:

-8 or -5

Step-by-step explanation: