Question

Find the following:-
1.
(m-5) (m+5)

Answer 1

Answer:

$m^{2} -25$

Step-by-step explanation:

The given mathematical statement is:

  $(m-5)(m+5)$

= $m^{2} -5^{2}$           $[(a+b)(a-b)=a^{2}-b^{2} ]$

= $m^{2} -25$   (ans)

For solving this type of term you have to remember The Rule given below.

                   $a^{2}-b^{2}=(a+b)(a-b)$

The Prove of the upper Rule is:

   $(a+b)(a-b)$

=  $a^{2}+ab-ab-b^{2}$

=  $a^{2} -b^{2}$

Hope you understood the Rule...

By- Md. Mominur Islam Mahim.