Question

practice set 5.1
expand (1/m-7) (1/m+1/2)

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Answer 1

Answer:

(1/m-7)(1/m+1/2).

It is in the form of (x+a)(x+b)=x²+(a+b)x+ab.

Where x=1/m, a=-7 & b=1/2.

(1/m-7)(1/m+1/2)=(1/m)²+(-7+1/2)(1/m)+(-7)(1/2).

=1/m²-7+1/2(1/m)-7(1/2).

=1/m²-14+1/2(1/m)-7/2.

=1/m²-13/2(1/m)-7/2. (Because -×+=- & largest number is important).

=1/m²-13/2m-7/2.

I think this is your answer.