So this is going to be equal to 1 minus p. Now, 0 minus p is going to be negative p. If you square it, you're just going to get p squared. So it's going to be p squared. Then plus p times. What's 1 minus p squared? 1 minus p squared is going to be 1 squared, which is just 1. Minus 2 times the product of this. So it's going to be minus 2p.