Question

-5x^2-456=-80x-1 for completing square with intermediate step in the form of (x+a)^2

Answer 1

Answer:  -27 = (x - 8)²

Step-by-step explanation:

-5x² - 456 = -80x - 1

       -455  = 5x² - 80x     added 5x² and 1 to both sides

         -91   =   x² - 16x      divided both sides by 5

                              ↓

                            $\dfrac{-16}{2}=-8$

   -91 + 64  = x² - 16x + (-8)²       added (-8)² = 64 to both sides

         -27   =  (x - 8)²