(3a-5b-2c)(-3a-5b+2c)

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(3a-5b-2c)(-3a-5b+2c)(3a-5b-2c)(-3a-5b+2c)(3a-5b-2c)(-3a-5b+2c)(3a-5b-2c)(-3a-5b+2c)=[-5b+(3a-2c)][-

(3a-5b-2c)(-3a-5b+2c)
(3a-5b-2c)(-3a-5b+2c)

(3a-5b-2c)(-3a-5b+2c)
(3a-5b-2c)(-3a-5b+2c)
=[-5b+(3a-2c)][-5b-(3a-2c)]
=(-5b)²-(3a-2c)²
= 25b²-(9a²-12ac+4c²)
=25b²-9a²+12ac-4c²

(3a-5b-2c)(-3a-5b+2c)
=[-5b+(3a-2c)]*[-5b-(3a-2c)]
=25b²-(3a-2c)²
=25b²-9a²-4c²+12ac