Question

3x^2-5-2x^3 find the value for -5

Answer 1

320

Explanation:

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

3(25) - 5 - 2(-125)

75 - 5 + 250

320

Answer 2

320

Explanation:

In order to evaluate the expression

3x² − 5 − 2x³ for x = -5, we just substitute x by -5 in our expression.

Step 1 :

3x² → 3(-5)² = 3 × 25 = 75

Step 2 :

2x³ → 2(-5)³ = 2 × (−125) = -125

Finally :

3x² − 5 − 2x³ → 75 − 5 − (-250) = 70 − (-250) = 70 + 250 = 320