Answer:
length = 2x⁴ + 3x² - x
Step-by-step explanation:
A = lw
Where:
A = Area of the Rectangle
l = length
w = width
A = 14x⁵ + 21x³ - 7x²
l = 7x
w = ?
Substitute values to the Formula:
A = lw
14x⁵ + 21x³ - 7x² = (7x) w
(14x⁵ + 21x³ - 7x²)/(7x) = [(7x) w]/(7x)
w = 2x⁴ + 3x² - x
Therefore, the length is 2x⁴ + 3x² - x
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