Question

$\times {}^{2} + \times y - 3.y {}^{2} \: para \: \times = 3 \: e \: y = .2$
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Answer 1

x = 3 ; y = 2

x² + x.y - 3y² =

3² + 3.2 - 3.2² =

9 + 6 - 3.4 =

15 - 12 = 3