Question

$3x {}^{3} + 9x {}^{2} - x + 8 \: when \: x = 4$
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Answer 1

We have

• To find the value of 3x³ + 9x² - x + 8 at x = 4

Here,

$\to \tt3 {(4)}^{3} + 9 {(4)}^{2} - (4) + 8 \\ \to \tt3(64) + 9(16) - 4 + 8 \\ \to \tt192 + 144 - 4 + 8 \\ \to \tt344 - 4 = \sf\red{340}$

Thus,

• Value of 3x³ + 9x² - x + 8 at x = 4 is 340

Answer 2

Answer:-

Step-by-step explanation:

your question that:-

$3x {}^{3} + 9x {}^{2} - x + 8 \: when \: x = 4$

solution

$3(4 \times 4 \times 4)+ 9(4 \times 4) - 4 + 8$

$3 \times 64 + 9 \times 16 - 4 + 8$

$192 + 144 + 4$

$340$

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