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just olya [345]
3 years ago
9

Which of the following equations have only one solution? Select all correct answers. 4x 2 + 4x = 0 x 2 + 6x + 9 = 0 9x 2 - 25 =

0 5x 2 + 20x + 20 = 0 x 2 - x - 6 = 0
Mathematics
2 answers:
Olin [163]3 years ago
7 0
The equations which have only one solution are: x²+6x+9=0 and 5x²+20x+20=0, 
Phoenix [80]3 years ago
3 0

Answer:

2nd and 4th equation will have only one solution.

Step-by-step explanation:

1). 4x² + 4x = 0

4x(x + 1) = 0

x = 0

or (x + 1) = 0 ⇒ x = -1

2). x² + 6x + 9 = 0

(x + 3)² = 0

(x + 3) = 0

x = -3

3). 9x² - 25 = 0

9x² = 25

x² = \frac{25}{9}

x = ±\sqrt{\frac{25}{9} }

x = ±\frac{5}{3}

4). 5x² + 20x + 20 = 0

5(x² + 4x + 4) = 0

(x + 2)²= 0

x + 2 = 0

x = -2

5). x² - x - 6 = 0

x² - 3x + 2x - 6 = 0

x(x - 3) + 2(x - 3) = 0

(x + 2)(x - 3) = 0

x = -2 or x = 3

Therefore, 2nd and 4th equations have only one solution.

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Answer:

180 minutes to cook 9lb turkey.

Step-by-step explanation:

Let the time taken to cook a 9lb turkey be x.

Using proportions,

6/120 = 9/x

6x = 120 x 9

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x = 1080/6

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3 years ago
Read 2 more answers
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Alex787 [66]

Answer:

The Coefficient is 3

Step-by-step explanation:

8 0
3 years ago
Graph the relation shown in the table. Is the relation a function? Why or why not?
patriot [66]

Answer:

The chosen topic is not meant for use with this type of problem. Try the examples below.

x + 6 y = 5

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Use the given functions to set up and simplify  

2 .

x y =

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2 =

0 − 4 = − 4

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Step-by-step explanation:

Find the equation with a point and y-intercept.

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The chosen topic is not meant for use with this type of problem. Try the examples below.

( 0 , 9 )  ,  ( 8 , 6 )

( 0 , 9 )  ,  ( 5 , 4 )  ,  ( 1 , 4 )

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3 years ago
What is the greatest common factor of the polynomial 40x^7+135x^4+5x^4
tensa zangetsu [6.8K]

5x^4

Step-by-step explanation:

simply we take 5x^4 bec. it can be divided by 40 and 135

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Least is on top, Greatest is on bottom
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