Select the correct answer. What is the value of ?

Select the correct answer.

What is the value of ?

A. 7/8

B. 7

C. 8

D.7/2

Solution

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Correct option is

A

−2

A(3,1)B(5,P)C(7,−5)

If points A(x

1

,y

1

),B(x

2

,y

2

),C(x

3

,y

3

) are collinear then

ar(△ABC)=

2

1

[x

1

(y

2

−y

3

)+x

2

(y

3

−y

1

)+x

3

(y

1

−y

2

)]=0

2

1

[3[5+p)+5(−5−1)+7(1−p)]=0

15+3p−30+7−7p=0

4p=−15+7

4p=−8

p=−2

Step-by-step explanation:

helps?:)

the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81