Simplify and find the value of 4x + x – 2x2 + x – 1 when x = -1.

1.	Simplify and find the value of 4x + x – 2x2 + x – 1 when x = -1.
Answer» Given expression = 4x + x – 2x² + x – 1 = 4x + x + x – 2x² – 1 = – 2x² + 6x – 1 If x = – 1 then, the value of – 2x² + 6x – 1 = – 2 (-1)2 + 6( – 1) – 1 = – 2(1) – 6 – 1 = – 2 – 6 – 1 = – 9

Answer»

Given expression = 4x + x – 2x² + x – 1

= 4x + x + x – 2x² – 1

= – 2x² + 6x – 1

If x = – 1 then,

the value of – 2x² + 6x – 1

= – 2 (-1)2 + 6( – 1) – 1

= – 2(1) – 6 – 1

= – 2 – 6 – 1

= – 9

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