Given | a + 1 | + (b-2) 2 = 0, find the value of 2A2 - [8ab + 12 (ab-4a2)] - 12ab | Math enthusiast | Mathematical art

Given | a + 1 | + (b-2) 2 = 0, find the value of 2A2 - [8ab + 12 (ab-4a2)] - 12ab

The original formula = 2a2-8ab-12ab + 2a2-12ab, = 4a2-9ab, ∵ | a + 1 | + (b-2) 2 = 0, ∵ a = - 1, B = 2, substituting a = - 1, B = 2 into the original formula, the original formula = 4 + 9 × 2 = 22

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