A student is asked to calculate the value of 212 − 132 using the identity x2 − y2 = (x − y)(x + y). The student's steps are show
n below. Step 1: 212 − 132 = (a − b)(a + b) Step 2: = (c)(d) Step 3: = (8)(30) + 8(4) Step 4: = 240 + 32 Step 5: = 272 What are the values of a, b, c, and d?
