All categories

3 years ago

X^2 -9 = -15 i got decimals please help me

2 answers:

7 0

Equation: x² - 9 = -15

Step-by-step solution:

• Move -9 to right side
-> x² = -15 + 9

• Solve
-> x² = -6

• Root of both sides
-> x = √-6
This is wrong because √-1 = imaginary number and it doesn't look like you're dealing with imaginary numbers so check the equation again

olga nikolaevna [1]3 years ago

4 0

Answer:

sqrt 24

Step-by-step explanation:

x^2-9=-15

x^2-9+9=-15+9

x^2=24

x=sqrt 24

You might be interested in

Solve each equation by completing the square <br>r² = –12r - 35

Fittoniya [83]

Answer:

r = - 7, r = - 5

Step-by-step explanation:

Given

r² = - 12r - 35 ( add 12r to both sides )

r² + 12r = - 35

To complete the square

add ( half the coefficient of the r- term )² to both sides

r² + 2(6)r + 36 = - 35 + 36

(r + 6)² = 1 ← take the square root of both sides )

r + 6 = ± 1 ( subtract 6 from both sides )

r = - 6 ± 1, thus

r = - 6 - 1 = - 7 or r = - 6 + 1 = - 5

7 0

3 years ago

Ann can build a model car in 3 hours, while sam can build the same model in 6 hours. How many hours would it take for them to bu

melamori03 [73]

X = Ann
Y = Sam
3x + 6y
x = -2y

7 0

3 years ago

Which values of a, b, and c correctly represent the answer in simplest form?

sergiy2304 [10]

Answer:

The answer for this is a=1,b=7,c=19.

5 0

3 years ago

Which of the following is a binomial experiment

andrew11 [14]

<span>A Binomial experiment has independent trails, and the outcome of a trial can be classified as either a success or a failure. Which two of the following statements also describe features of a binomial experiment?

</span>

4 0

3 years ago

Read 2 more answers

A certain prescription drug diminishes in the system at a rate of 25% per hour. If a person was administered 1450mg of the drug,

Helen [10]

9514 1404 393

Answer:

459 mg
about 20 hours

Step-by-step explanation:

The decay factor is 1 -25% = 0.75 per hour, so the exponential equation can be written ...

r(t) = 1450·0.75^t . . . . . milligrams remaining after t hours

a) After 4 hours, the amount remaining is ...

r(4) = 1450·0.75^4 ≈ 458.79 . . . mg

About 459 mg will remain after 4 hours.

b) To find the time it takes before the amount remaining is less than 5 mg, we need to solve ...

r(t) < 5

1450·0.75^t < 5 . . . . use the function definition

0.75^t < 5/1450 . . . . divide by 1450

t·log(0.75) < log(1/290) . . . . . take logarithms (reduce fraction)

t > log(1/290)/log(0.75) . . . . . divide by the (negative) coefficient of t

t > 19.708

It will take about 20 hours for the amount of the drug remaining to be less than 5 mg.

7 0

3 years ago