a-2b+c,a+2b-c multiply
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(a - 2b + c)( a + 2b - c)
= a(a + 2b - c) - 2b(a + 2b - c) + c(a + 2b - c)
= a² + 2ab - ac - 2ab - 4b² + 2bc + ac + 2ab - c²
= a² + (2ab - 2ab + 2ab) + ( -ac + ac) - 4b² - c²
= a² + 2ab - 4b² - c²
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