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Mandarinka [93]
3 years ago
11

The first three steps for solving the quadratic equation by completing the square are shown. Fill in the missing number in the l

ast step.
9x2 +54x = 7

9(x2 + 6x) = 7

9(x2 + 6x + 9) = 7 +.?
Mathematics
2 answers:
gulaghasi [49]3 years ago
5 0
Completing the square is done as follows:

1. Write the equation in a way that the constants are in the right side while the terms with x are on the left. 
<span>9x2 +54x = 7
</span>
2. Make sure that the coefficient of the x^2 term is 1.
<span>9(x2 + 6x) = 7
</span>
3. Adding a term to both sides that will complete the square in the left side. This is done by dividing the coefficient of the x term by 2 and squaring it. Note: The same amount should be added to the right side to balance the equation.
<span>9(x2 + 6x + 9) = 7 + 81

9(x+3)^2 = 88
</span>
Westkost [7]3 years ago
4 0

Answer:

? = 81

Step-by-step explanation:

You might be interested in
(5+w)(w+4) in standard form
dlinn [17]

Answer:

  w² +9w +20

Step-by-step explanation:

Multiply it out, collect terms, and write as descending powers of w.

  (5+w)(w+4) = 5w +5·4 +w² +w·4

  = w² +9w +20

7 0
3 years ago
Which one is the missing number? Help please
Readme [11.4K]
The answer is 2.
it’s adding 2 everytime!
5 0
3 years ago
The midpoint of KL is M (-8,1). One endpoint is K (-6,5) find the coordinates of the other endpoint L
PSYCHO15rus [73]

Answer:

Midpoint (x , y) of two points is

( x1 + y1/2 , x2 + y2/2)

Midpoint of KL is M ( -8 , 1)

Let the coordinates of L be ( a , b)

From the above definition

Midpoint between K(-6 , 5) and

L ( a ,b) is

(-8 , 1) = ( -6+a/2 , 5+b/2)

Comparing first point with - 8

- 8 = -6 + a /2

Multiply through by 2

We get

-16 = - 6 + a

a = -16+6

a = - 10

Comparing the second point with 1

1 = 5+b/2

Multiply through by 2

2 = 5 + b

b = 2 - 5

b = -3

Therefore a = -10 and b = - 3

Hence the coordinates of

L is ( -10 , - 3)

Hope this helps

3 0
3 years ago
ALGEBRA HELP ASAP
Debora [2.8K]
When x=1/4 x²=1/16 so f(1/4)=y=2 1/16 last answer
5 0
3 years ago
(x - 3) - 2(x + 6) = -5
vekshin1

Answer:

Alright solve for x by multiplying both sides of the equation then isolating the variable

x = - 10 Hope this helps :)

Step-by-step explanation:


5 0
3 years ago
Read 2 more answers
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