I assume that you mean: . This is a difference of squares which can be factored to:
. Factor out (?) the common factor. You get the result in the bracket by dividing each summand by the factor in front of the bracket:
That's the answer I got for the second one too, but the book had a different one. Actually, the answer comes to the same thing it's just written differently.
Are you sure it doesn't say ? You wouldn't wanna make a typo like that on a test (I have done it before and lost 5 points for one sign so watch for it)
That's the answer I got for the second one too, but the book had a different one. Actually, the answer comes to the same thing it's just written differently.
Which one am I meant to do in a test?
If the question asks you to factorise something full marks will be given
for as complete a factorisation as possible under the constraints you
are expected to observe (probably factors with real coefficients).