Question: how to factor quadratic trinomials by grouping?
Answer: To factor a trinomial in the form x2 + bx + c, find two integers, r and s, whose sum is b and whose product is c. Rewrite the trinomial as x2 + rx + sx + c and then use grouping and the Distributive Property to factor the polynomial. The resulting factors will be (x + r) and (x + s).