All categories

3 years ago

Solve by completing the square with working out -6x-x^2-8

Mathematics

1 answer:

horrorfan [7]3 years ago

4 0

Answer:

x = -3 +/- sqrt(17)

Step-by-step explanation:

-6x - (x^2) - 8 = 0

-((x^2) + 6x + 8) = 0

(x^2) + 6x + 8 = 0

(x + 3)^2 - 1 = 0

(x + 3)^2 = 1

x + 3 = +/- sqrt(1)

x + 3 = +/- 1

x = -3 +/- 1

x = -4, -2

You might be interested in

What is the negative number between -3 and -2

neonofarm [45]

-2.5 would be inbetween

6 0

3 years ago

Read 2 more answers

How do i write a proof for this

babymother [125]

Since, the co-interior angles(55° and 125°) are supplementary(sum is 180), therefore the lines are parallel.

6 0

3 years ago

Factor completely: x^2-y^2-1.5(x-y)

guapka [62]

Answer: x^2 - y ^2 − 1.5x + 1.5y

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

I need help w #5 first to answer will be marked brainliest!! Plz and thank you :)

mojhsa [17]

Answer:

1+1+2

Step-by-step explanation:

I'm the first one to answer to mark me Brainless!

3 0

3 years ago

From a boat ont he lake, the angle of elevation to the top of a cliff is 11° 50'. If the base of the cliff is 1568 feet from the

Marizza181 [45]

Answer:

328 feet

Step-by-step explanation:

From a boat ont he lake, the angle of elevation to the top of a cliff is 11° 50'. If the base of the cliff is 1568 feet from the boat, how high is the cliff (to the nearest foot)

Step 1

Note that

that 11°50' is just 11 degrees and 50 minutes

60 minutes = 1 degree,

thus 50 minutes = x degree

50/60 degrees

= 0.83°

Hence: 11°50' = 11.83°.

Step 2

We solve using Trigonometric function of tan

tan theta = Opposite/Adjacent

theta = 11.83°

Adjacent = 1568 feet

Opposite = Height of the cliff = x

tan 11.83° = x/1568

Cross Multiply

x = tan 11.83 × 1568

x = 328.429195 feet

Approximately = 328 feet

The height of the cliff is 328 feet

8 0

3 years ago