The two lines graphed on the coordinate grid each represent an equation.
7.
6
5
4
2
6514
2
1
3
-
Which ordered pair represents a solution to both equations?
A.
(-4, 3)
B. (-3,-4)
C. (-4,-3)
D. (4, -3)
Need

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17

the answer is 13 cm

the radius is 2 times the diameter.

step-by-step explanation:

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