
Formula : (ax+b)(cx+d) = acx^{2}+x(ad+bc)+b.dExample: Find the product of (2x+3)(2x+5). Solution: Using above formula, Here a=2, b=3, c=2 and d=5 (2x+3)(2x+5) = (2.2)x^{2}+x(2.5+3.2)+3.5 = 4x^{2}+x(10+6)+15 = 4x^{2}+16x+15 Directions: Solve the following problems. Also write at least ten examples of your own. 