LESSON 4: SOLVING QUADRATIC EQUATIONS BY COMPLETING TH Let's Recall Fill in the blank to make the trinomial a perfect square. 2) x² - 14x + below. 2) (3x + 5)² 1) x² + 12x +9 Expand the given polynomial SQUARE 1) (x + 2)² Simplify the following radicals. 1) √12 2) 2√27 3) x² + 12x + 1 3) (+)² 3) V50 5​