H2 (g) + F2(g) à 2HF (g) + 536 KJ which of the following statements is correct? A. 536 KJ are absorbed in an exothermic reaction.
B. 536 KJ are released in an exothermic reaction
C. 536 KJ are released in an endothermic reaction?
D. 536 KJ are absorbed in an endothermic reaction.

the barter

6 cars because if you have 8 and subtract 2 youll have 6 left over

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