(4b+3a-5c)(3a-4b+5c)=?

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(4b+3a-5c)(3a-4b+5c)=?(4b+3a-5c)(3a-4b+5c)=?(4b+3a-5c)(3a-4b+5c)=?(4b+3a-5c)(3a-4b+5c)=(3a)²-(4

(4b+3a-5c)(3a-4b+5c)=?
(4b+3a-5c)(3a-4b+5c)=?

(4b+3a-5c)(3a-4b+5c)=?
(4b+3a-5c)(3a-4b+5c)
=(3a)²-(4b-5c)²
=9a²-16b²-25c²+40bc

(4b+3a-5c)(3a-4b+5c)
=[3a-(5c-4b)][3a+(5c-4b)]
=(3a)^2-(5c-4b)^2
=9a^2-25c^2-16c^2+40bc