Question

Evaluate 2x³-x-4 when x=-1

Answer 1

X= -1 = 0

=1

2x^3-1-4

=2*1^3-1-4

= 2-1-4

=(-1) -4

=(-5)

Answer 2

When
$x = - 1 .............(1)$
In this equation,,
${2x}^{3} - x - 4$
From 1, we get
$2( - 1) ^{3} - ( - 1) - 4$
$= - 2 + 1 - 4 \\ = - 5$