From 7 + x − x2, take away 9 + x + 3x2 + 7x3.

1.	From 7 + x − x2, take away 9 + x + 3x2 + 7x3.
Answer» Given 7 + x − x², take away 9 + x + 3x² + 7x³ = (7 + x – x²) – (9 + x + 3x² + 7x³) = 7 + x – x² – 9 – x – 3x² – 7x³ = – 7x³– x² – 3x² + 7 – 9 = – 7x³ – 4x² – 2

Answer»

Given 7 + x − x², take away 9 + x + 3x² + 7x³

= (7 + x – x²) – (9 + x + 3x² + 7x³)

= 7 + x – x² – 9 – x – 3x² – 7x³

= – 7x³– x² – 3x² + 7 – 9

= – 7x³ – 4x² – 2

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