find the value of 3x^3 +9x^2 —x + 8, when x = 4
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17
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
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