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Savatey [412]
2 years ago
15

Can someone explain this pls

Mathematics
1 answer:
Ludmilka [50]2 years ago
4 0

Answer:

Step-by-step explanation:

( g ° f )(x) = ( x + 7 )² = x² + 14x + 49

20 + 3(x² + 14x + 49) = - 34

20 + 3x² + 42x + 147 = - 34

3x² + 42x + 201 = 0 ⇔ x² + 14x + 67 = 0

D = 196 - 268 = - 72 < 0

There is no any roots in set of real numbers.

The values of x in set of complex numbers are:

x_{12} = \frac{- 14 }{2} ± \frac{6\sqrt{2}i }{2}

x_{12}  = - 7 ± 3√2 i  

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4 years ago
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