Step 1. Use the FOIL (multiply the First, Outer, Inner, and Last terms)
Step 2. Simplify by combining like terms and in this case -30x-30x=-60x
Step 3. ANSWER:
I hope the above steps and explanation were helpful.
For free Step-By-Step Videos in Introduction to Algebra, please visit http://www.FreedomUniversity.TV/courses/IntroAlgebra and for Trigonometry, please visit http://www.FreedomUniversity.TV/courses/Trigonometry.