What equation results from completing the square and then factoring? x^2-8x=39

Answer soon(fast) 15 pts-brainliest? for right answer with small explination a restaurant catered a party for 40 people. a child’s dinner (c) cost $11 and an adult’s dinner (a) cost $20. the total cost of the dinner was $728. how many children and adults were at the party? use the table to guess and check.(i couldn't get the graph onto the question)                                8 children and 32 adults9 children and 31 adults10 children and 30 adults12 children and 28 adults

Determine the standard form of the equation of the line that passes through (-2,0) and (8,-5)

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?