x²(x+6) +8x=2688 find x
Answers
Answered by
1
Answer:
x = 12
Subtract 2688 from both sides.
Factor left side of equation.
Set factors equal to 0.
x = 12
Answered by
3
Answer:
→ x² (x + 6) + 8x = 2,688
→ x³ + 6x² + 8x = 2,688
→ x³ + 6x² + 8x - 2,688 = 2,688 - 2,688
→ x³ + 6x² + 8x - 2,688 = 0
→ ( x - 12 ) ( x² + 18x + 224 ) = 0
→ x - 12 = 0 or x² + 18x + 224 = 0
→ x = 12
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