f '(x) = 2(3x2 + 5) + 6x(2x - 1) ... + 3), s(x) = x - 4. Use the product rule table. below to get: r'(x) = 20x + 11. s'(x) = 1 ... f'(x) = (x - 4)(20x + 11) - (5x - 2)(2x + 3)/(x - 4)2.First, we will distribute 2x to (x + 5), then we will distribute 3. ... 5x. That is,. multiplying binomials. 6x − x= 5x. Example 2. Multiply (3x − 1)(x + 2). Answer. 3x2 + 5x