If the coefficient a in the general quadratic equation is equal to 9, what is the focal length for the

Mathematics

1 answer:

lutik1710 [3]3 years ago

5 0

Answer:

Step-by-step explanation:

Let the equation of a parabola be

$y^{2}$ = 4ax.

Then , focal length of the parabola is a.

As , (0,0) is the vertex and its focus is (a,0)

Thus, focal length comes out to be a.

Here,

a is given as 9 units .

Thus focal length of the parabola, d, equals to 9 units

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Given f(x)=7(9−x)−4, what is the value of f(−1) ? Enter the answer in the box.

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Solution:

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