Question

Find the value of the given expression for a= (-2) : a cube+5a square + 5a-2

Answer 1

Answer:

-2^3+5(-2)^2+5(-2)-2

= -8+20-12

=0

Step-by-step explanation:

Answer 2

Answer:

0

Step-by-step explanation:

Given expression is :

a³ + 5 a² + 5 a - 2

We are told that a is given as - 2 .

This means that if we put a as -2 we will get the value of the expression as required by the question.

( - 2 )³ + 5 ( - 2 )² + 5 ( - 2 ) - 2

Cubing means to multiply the same number thrice.

Hence ( - 2 )³ = - 2 × - 2 × - 2

= > - 8

Remember :

minus × minus = plus .

plus × minus = minus .

So ( - 2 )² = - 2 × - 2 = 4

So the given expression is :

( - 2 )³ + 5 ( - 2 )² + 5 ( - 2 ) - 2

= > - 8 + 5 × 4 - 10 - 2

= > - 8 + 20 - 10 - 2

= > 20 - 12 - 8

= > 20 - 20

= > 0

The given expression will be 0 .