Question

find the value of 3x^3 +9x^2 —x + 8, when x = 4​

Answer 1

$3x {}^{3} + 9 {x}^{2} - x + 8$

$3(4) {}^{3} + 9( {4}^{} ) {}^{2} - 4 + 8$

$192 + 144 - 4 + 8$

$340$

Answer 2

Answer:

340

Step-by-step explanation:

3x³+9x²-x+8

= 3(4)³+9(4)²-4+8

= 3(64)+9(16)+4

= 192+144+4

= 336+4

= 340