X^2+8x+16 find fracrorise​

Iwll give extra points to who gets this for ! what type of reaction is this? ?

Match the acid base pairs by arranging the acid name with the conjugate base formula. hydrogen carbonate hydrogen phosphate carbonic acid read water sulfuric acid phosphoric acid a. co32- b. hso4- c. hco3- d. po43- e. h2po4- f. oh-

Why does his teacher ask him to balance the equation by including the correct coefficient