When subtracting 3x2 + 4x + 9 from 15x? + 6x - 12, which TWO choices are correct? es )))
A)
Write the problem as 3x2 + 4x + 9 - (15x2 + 6x - 12).
B)
Write the problem as 15x² + 6x - 12 - (3x² + 4x + 9).
0
The difference is -12x2 - 2x + 3.
D)
The difference is 12x? + 10x - 3
E)
The difference is 12x2 + 2x - 21.

the first one, all those points on the line just make a strait line.

answer

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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