Which is a balanced chemical equation? OA. C7H16 + 5026CO2 + 4H20
OB.
C7H16 + 1102 7CO2 + 8H20
OC. C7H16 + 1402 7CO2 +5H20
OD
C7H16 +220214CO2 + 16H20

b

step-by-step explanation:

93-8=85

855=17

17*4=68

there are 68 purple marbles in that bag

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