Mathematics>Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
Which of the following is equivalent to 4-4a-(5+a)(5-a)?
Choice C is correct. First follow the order of operations to get the following.
Since the answer choices do not match this, look for more factors.
The factors of -21 that add to -4 are -7 and 3.
Therefore, the answer is (a-7)(a+3).