Question

.Add 3x 2–4x + 7 and –5x2+ 6x + 9.

Answer 1

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$\longrightarrow \sf( {3x}^{2} - 4x + 7) + ( - {5x}^{2} + 6x + 9) \\ \\ \longrightarrow \sf {3x}^{2} - 5 {x}^{2} - 4x + 6x + 7 + 9 \\ \\ \longrightarrow \sf - 2 {x}^{2} + 2x + 16 \\ \\ \longrightarrow \sf2( { - x}^{2} + x + 8)$