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lara31 [8.8K]
3 years ago
15

What is the axis of symmetry of the function f(x)=-(x+9)(x-21)

Mathematics
1 answer:
Firlakuza [10]3 years ago
3 0
Carry out the mult.:  f(x) = -[x^2 - 21x + 9x - 189] 

Combine like terms:  f(x) = -[x^2 - 12x - 189]
Eliminate the brackets [   ]:      f(x) = -x^2 + 12x + 189
Identify coefficients a, b and c:   a= -1, b=12, c=189

The equation of the axis of symmetry is    x = -b/(2a), which here equals

x = -(12)/[2(-1)], or     x = 6

This is also the x-coordinate of the vertex.  Plug x=6 into the original equation to calculate the y-coordinate.
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3 years ago
Please dont steal I just need a bit of help here I would really appreciate it I will give brainless
Ksenya-84 [330]

Answer:

<h2>7.25</h2>

Step-by-step explanation:

I gave you the answer earlier too!

for more info !

<h2>there s a theorem called MIDPOINT THEOREM </h2>

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<h2>so AB=1/2of YZ</h2>

which means

2x-4 = 1/2×21

thus, 2(2x-4) =21

=> 4x-8 = 21

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<h3>How to find the cost?</h3>

The advertisement says that the original cost of the ball is $30 but there is a 25% discount.

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Rest of the question is:
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Find out more on cost of soccer ball at brainly.com/question/2227883

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What is the value of sinθ given that (5, −12) is a point on the terminal side of θ ?
LekaFEV [45]
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5 0
3 years ago
Read 2 more answers
Please help due today
aleksklad [387]
Turn the triangle around, because you have to reflect it, if you need extra help lmk
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