Solve the quadratic equation by completing the square.
x^2-18x+78=0
first, choose the appropriate form and fill in the blanks with the correct numbers.
a.) (x+? )^2=?
or
b.) (=?

then, solve the equation.
x=?

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem