3 years ago

Find the center and the radius of the circle with the equation: x^2-4x+y^2

Mathematics

1 answer:

zysi [14]3 years ago

8 0

Answer:

Step-by-step explanation:

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-x^(2)-12=-87<br><br> Please explain your answer, and how I make the x positive

spayn [35]

Solve for x over the real numbers:
-x^2 - 12 = -87
Add 12 to both sides:
-x^2 = -75
Multiply both sides by -1:
x^2 = 75
Take the square root of both sides:
Answer: x = 5 sqrt(3) or x = -5 sqrt(3) both Answers are correct

7 0

3 years ago

Given Sin x= 0.5, what is cos x?

Svetllana [295]

Sin x = 0.5
sin x = 1/2
sin x = opp/hyp
therefore the ratio of opp/hyp = 1/2, (opp = 1, hyp = 2)

Find the opp side

1² + x² = 2²
1 + x² = 4
x² = 4 -1
x² = 3
x =√3

The opp side is √3

cos x = opp/hyp = √3/2 = 0.87 (round to the nearest hundredths)

3 0

3 years ago

What’s an equation that passes through the ordered pair (3,7)and has a slope of -4

natita [175]

For this case we have that by definition, the equation of the line of the slope-intersection form is given by:

$y = mx + b$