Question

x^2-3x+6 + -9x^2y+3x+6

Answer 1

$= {x }^{2} - 3x + 6 - 9 {x}^{2} y + 3x + 6 \\ = {x}^{2} - 3x + 3x + 6 + 6 - 9 {x}^{2} y \\ = {x}^{2} - 9 {x}^{2} y + 12 \\ = - 9 {x}^{2} y + {x}^{2} + 12$

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