Question

9(a-2)^2 - 16(a+2)^2
Answer plzzz
The correct answer will be marked as brainliest​

Answer 1

Hey mate!!!! Here the answer is :-

9(a-2)^2-16(a+2)^2

=Using identities:-(a-b)^2=a^2+b^2-2ab

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

=(a-2)^2=(a)^2+(2)^2-2(a)(2)=a^2+4-4a

=(a+2)^2=(a)^2+(2)^2+2(a)(2)=a^2+4+4a

Now, we get,

=9(a-2)^2-16(a+2)^2=9(a^2+4-4a)-16(a^2+4+4a)

=9a^2+36-36a-16a^2-64-64a

=9a^2-16a^2-36a-64a+36-64

=-7a^2-100a-28

Hope it will help you!!!!

Answer 2

Hey mate see the right answer

9 (a-2)^2 - 16(a+2)^2

=9 ((a)^2+(2)^2-2×a×2)-16 (a)^2+(2)^2+2×a×2)

=9 (a^2+4-4a)-16 (a^2+4+4a)

=9a^2+36-36a-16a^2-64-64a

=9a^2-16a^2-36a-64a+36-64

=-7a^2-100a-28

Hope you are happy with answer