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PSYCHO15rus [73]
4 years ago
12

Which equation shows the quadratic function used to solve 7x^2=9+x for x?

Mathematics
2 answers:
LuckyWell [14K]4 years ago
8 0

Answer:

Step-by-step explanation:

Sati [7]4 years ago
6 0

For this case we have the following equation of the second degree:

7x ^ 2 = 9 + x

Rewriting:

7x ^ 2-x-9 = 0

The solutions will be given by the following equation:

x = \frac {-b \pm \sqrt {b ^ 2-4 (a) (c)}} {2a}

We have to:

a = 7\\b = -1\\c = -9

Substituting the values:

x = \frac {- (- 1) \pm \sqrt {(- 1) ^ 2-4 (7) (- 9)}} {2 (7)}\\x = \frac {1 \pm \sqrt {(- 1) ^ 2 + 4 (7) (9)}} {2 (7)}

Answer:

Option D

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A telescope costs $126 with a 30% discount. What was the original price?
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Answer:

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