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erica [24]
3 years ago
11

Use the Completing the Square method to solve for x.

Mathematics
1 answer:
olga nikolaevna [1]3 years ago
6 0

Answer:

x = -1

x = -5

Step-by-step explanation:

y= (x+3)^2 - 4

(x + 3)^2 = x^2+6x+9

y = x^2 + 6x + 9 - 4

y = x^2 + 6x + 5

x^2 + 6x = -5

x^2 + 6x + 9 = -5+9 (6/2=3, 3^2 = 9) (add 9 to both sides)

(x + 3)^2 = 4

x + 3 = sqrt 4

x + 3 = +- 2

x + 3= 2. x = 2-3. x = -1

x + 3 = -2. x = -3-2. x = -5

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The total number of subsets of {A, B, C} is _____.. . . a.6. b.7. c.8
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4 years ago
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The distances between three cities on a map are 45 miles, 56 miles, and 72 miles. Do the positions of
ollegr [7]

Answer:

The position of the three cities do not form a right-triangle.

Step-by-step explanation:

There are three cities on a map (say A, B, and C).

Now, the distances between them are 45 miles, 56 miles, and 72 miles.

i.e. AB= 45 miles, BC= 56 miles and CA =72 miles.

If the three cities A, B, C form a right-angled triangle on the map, then applying Pythagoras Theorem AB² +BC² =AC²

or, AC= √(AB² +BC²) must be satisfied.

Now, right-hand side of the above equation =√(45²+56²) =71.84 ≠ 72 (AC)

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6 0
4 years ago
The table shows ordered pairs of the function y = 8 - 2x. When x = 8, the value of y is ?
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6 0
3 years ago
George decided to use blue paint to paint a wall with two windows. The wall is 12 7 8 ft by 8 ft. Both windows are 3 1 2 ft by 4
masha68 [24]

Answer:

71 1/2 square feet

Step-by-step explanation:

We want to find the area of the wall that will be painted.

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Each window is 3 1 /2 ft by 4 1/2 ft. The area of each window is therefore:

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The area of the wall that will be painted is therefore:

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4 years ago
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