Question

3) Simplify: (7k-6r+5m) × (7k+6r -5m) in english full solution ​

Answer 1

Step-by-step explanation:

$\huge\sf\underline\pink{solution}$

= (7k-6r+5m)×(7k+6r-5m)

= 7k(7k+6r-5m)-6r(7k+6r-5m)+5m(7k+6r-5m)

= 49k^2+42kr-35mk-42kr-36r^2-30rm+35mk+30mr-25m^2

= 49k^2-36r^2-25m^2+42kr-42kr-35mk+35mk-30mr+30mr

= (7k)^2-(6r)^2-(5m)^2

Answer 2

$\huge\sf\underline\pink{Solution}$

(7k-6r+5m) ( 7k +6r-5m)

7k(7k+6r-5m)-6r(7k+6r-5m)+5m(7k+6r-5m)

49k²+42kr-35km-42kr-36r²+30mr+35km+30mr-25m²

49k²-36r²-25m²

(7k)²-(6r)²-(5m)²