Which expression is equivalent to
1 answer:
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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:
=
±
= - 7 ± 3√2 i
Answer:
B.
Step-by-step explanation:
Since the numbers in the root is all the same, lets say is a variable.
7x - 4
+ x
Group with like terms:
7x + x
- 4
Combine like terms:
8x - 4
There you have it! Since all the square roots are the same thing, we can treat them like variables.