(4a-3b+2c)^2-(3b-4a-2c)(2c-3b-4a)

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(4a-3b+2c)^2-(3b-4a-2c)(2c-3b-4a)(4a-3b+2c)^2-(3b-4a-2c)(2c-3b-4a)(4a-3b+2c)^2-(3b-4a-2c)(2c-3b-4a)(

(4a-3b+2c)^2-(3b-4a-2c)(2c-3b-4a)
(4a-3b+2c)^2-(3b-4a-2c)(2c-3b-4a)

(4a-3b+2c)^2-(3b-4a-2c)(2c-3b-4a)
(4a-3b+2c)^2-(3b-4a-2c)(2c-3b-4a)
=(4a-3b+2c)² -[-4a+(3b-2c)][-4a-(3b-2c)]
=[4a-(3b-2c)]²-[-4a+(3b-2c)][-4a-(3b-2c)]
=(4a)²-2×4a(3b-2c)+(3b-2c)²-(-4a)²+(3b-2c)²
=-8a(3b-2c)+2(3b-2c)²
=-24ab+16ac+18b²-24bc+8c²