Question

Reslove 16a2-81a2 into factors

Answer 1

Answer:

-65a

Step-by-step explanation:

16a^2=(4a)^2

81a^2=(9a)^2

(4a)^2-(9a)^2=?

a^2-b^2=(a+b)(a-b)

here a=4a ;b=9a

a+b=4a+9a

     =13a

a-b=4a-9a

     =-5a

(a+b)(a-b)=13a*-5a

              =-65a