Question

If m=3 and n=4 evaluate (m+n) (m-n)

Answer 1

Answer:

-7

Step-by-step explanation:

(m+n) (m-n)

(3+4)(3-4)

7(-1)

-7

Answer 2

Answer:

using identity[(a+b)(a-b) = a^2 - b^2]

(m+n)(m-n) = m^2 - n^2

m^2 - n^2 = (3)^2 - (4)^2 = -7

OR

in a simple way but the above way is more preferred than this :D

(m+n)(m-n)

(3+4)(3-4)

7*-1

= -7

so ultimately your answer is -7.

hope it helps!

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