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3 years ago

Solve x2 + 6x = 7 by completing the square. Which is the solution set of the equation?

1 answer:

3 0

For the answer to the question above, from the equation x^2 - 6x + 7 = 0 , b is equal to -6. The form should become y = (x-(b/2)^2) + c. (b/2)^2 is equal to 9. Hence,

0 = (x - 3)^2 -9 + 7
0 = (x - 3)^2 -2
2 = (x - 3)^2

x should be equal to -1.5858 and -4.4142
I hope this helps

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im not sure on how to do this If one angle of a triangle is 30° more than twice another angle, and the third angle is equal to t

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Answer:

Step-by-step explanation: How do you find the 3rd angle of a triangle?

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2 years ago

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.944
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How many child tickets were sold that day?

ExtremeBDS [4]

$\huge\boxed{\fcolorbox{black}{red}{Answer}}$

first let's name a couples of variable

• the number of adults tickets sold: a

• the number of children tickets sold: c

From the problem we know

a + c = 128

and

$5.40c + $9.20a = $976.20

1) solve the equation to alpha

a+c-c = 128 -c

a+0=128-c

a=128-c

2) substitute (128 - c) for a in the second equation and solve to c

$5.40c + $9.20a = $976.20 become

$5.40c + $9.20(128 - c) = $976.20

$5.40c + ($9.20 × 128) - ($9.20 - c) = $976.20

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($5.40 - $9.20)c +$1177.6 = $976.20

-$3.80c + $1177.6 = $9.76.20

-$3.80c + $1177.60 - $1177.60 = $976.20 - $1177.60

-$8.30c + 0 = $201.40

-$3.80c = - $201.40

-$3.80c. -$201.40

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