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Ad libitum [116K]
2 years ago
13

PLS HELP! solve by completing the square x²+4x=8

Mathematics
1 answer:
masya89 [10]2 years ago
4 0

Step-by-step explanation:

x²+4x=8

rearrange

x² + 4x - 8 = 0

half of 4 is 2

so

x² + 4x + 2² - 2² - 8 = 0

do x² + 4x + 2²

multiplies to give 4 adds to give 4

2+ 2

(x + 2)²

(x + 2)² - 2² - 8

(x + 2)² - 4 - 8

(x + 2)² - 12

(x + 2 + √12) (x + 2 - √12)

√12 = √4 * √3 = 2 √3

(x + 2 + 2√3) (x + 2 - 2√3)

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Bill drove 715 miles in 11 hours.
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Answer: It would take 7 hours.

Step-by-step explanation:

715/11 = 65

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6 0
3 years ago
Alberto spent half of his weekly
maw [93]

Answer:

$8

Step-by-step explanation:

We can write an equation with the scenario given and solve for what we need, Alberto's weekly allowance.

Let his weekly allowance be "x"

Since he spend HALF of it, he spent 0.5x of it.

He has remaining also 0.5x of it

Now, whatever he has (0.5x), he gets $4 more from cleaning windows. After that he has:

0.5x + 4

This amount is equal to $8, so we can write:

0.5x + 4 = 8

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So, alberto's weekly allowance is $8

6 0
3 years ago
Factorize: x² + 3x + 2​
zvonat [6]

Step-by-step explanation:

x² + 3x + 2

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By taking out common terms, we get

x(x+1)+2(x+1)

(x+1)(x+2)

7 0
3 years ago
Alphabet has how many letters?
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The alphabet has 26 letters
7 0
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Answer:

4

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