Some steps to rewrite the expression x3 − 16x + x2 − 16 as a product of three factors are shown below: step 1: x3 − 16x + x2 − 16 step 2: x3 + x2 − 16x − 16 step 3: x2(x + 1) − 16(x + 1) which of the following best shows the next two steps to rewrite the expression? step 4: (x2 + 16)(x + 1); step 5: (x + 4)(x + 4)(x + 1) step 4: (x2 − 16)(x + 1); step 5: (x + 4)(x + 4)(x + 1) step 4: (x2 − 16)(x + 1); step 5: (x − 4)(x + 4)(x + 1) step 4: (x2 + 16)(x + 1); step 5: (x − 4)(x + 4)(x + 1)