Which are the solutions of 3x2 – 2x – 5 = 0 by factoring?

A.
−5,
1
3

B.
−1,
5
3

C.
−1,−
5
3

D.
5,
1
3

the height of the surface increases from the center out to the sides of the road

it is c!

1k

step-by-step explanation:

-6k+7k

(-6+7)k

1k

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