Question

Value of 2a(a^3+7a-5a+4)for a=(-1)
options
a)(-5)
b)(-4)
c)(-3)
d)(-2)​

Answer 1

Answer:

$= 2a( {a}^{3} + 7a - 5a + 4)$

$= put \: value \: a \: = - 1$

$= 2( - 1)( { - 1}^{3} + 7( - 1) - 5( - 1) + 4)$

= -2 (-1 -7 +5+4)

= -2 ( -8+9)

= -2 (1)

= -2

Answer 2

Answer:

2a(a

3

+7a−5a+4)

= put \: value \: a \: = - 1=putvaluea=−1

= 2( - 1)( { - 1}^{3} + 7( - 1) - 5( - 1) + 4)=2(−1)(−1

3

+7(−1)−5(−1)+4)

= -2 (-1 -7 +5+4)

= -2 ( -8+9)

= -2 (1)

= -2

HOPE IT HELPS