+118724 ** You should learn to recognise this.
When you factorise a difference of 2 squares this is what you get. One bracket is the conjugate of the other. Only the sign in the middle is different.
$$x^2-a^2=(x-a)(x+a)$$
OR if you simplify
$$(x-a)(x+a)=x^2-a^2$$
Yours was
(m-2)(m+2) so the answer should become obvious to you as $$m^2-2^2=m^2-4$$
+33666 I guess you just want this to be expanded?
(m+2)(m-2) = m2 - 2m + 2m - 22 = m2 - 22 = m2 - 4
+118724 ** You should learn to recognise this.
When you factorise a difference of 2 squares this is what you get. One bracket is the conjugate of the other. Only the sign in the middle is different.
$$x^2-a^2=(x-a)(x+a)$$
OR if you simplify
$$(x-a)(x+a)=x^2-a^2$$
Yours was
(m-2)(m+2) so the answer should become obvious to you as $$m^2-2^2=m^2-4$$
