# Math Help - Taking a minus sign as a factor.

1. ## Taking a minus sign as a factor.

(2-a)(2+a)=-(a-2)(2-a)
Or
(2-a)(2+a)=-[(a-2)(2-a)]
Or
(2-a)(2+a)=-(a-2)*-(2-a)

Which of these would be correct?

2. ## Re: Taking a minus sign as a factor.

Originally Posted by Beetle
(2-a)(2+a)=-(a-2)(2-a)
Or
(2-a)(2+a)=-[(a-2)(2-a)]
Or
(2-a)(2+a)=-(a-2)*-(2-a)

Which of these would be correct?
none are correct.

$(2-a)(2+a) = -(a-2)(2+a)$

3. ## Re: Taking a minus sign as a factor.

(2-a)(2+a)=-[(a-2)(-2-a)]
Or
(2-a)(2+a)=-(a-2)*-(-2-a)

4. ## Re: Taking a minus sign as a factor.

Originally Posted by Beetle
(2-a)(2+a)=-[(a-2)(-2-a)]
Or
(2-a)(2+a)=-(a-2)*-(-2-a)

check by substituting a value in for $a$ to see if the factorization works.