(3x² - 5x - 12) feet is the answer.
How to solve the quadratic equation?
The four techniques of fixing a quadratic equation are factoring, using the rectangular roots, finishing the square, and the quadratic formula.
(10x + 3x² - 8) - (15x + 4)
(10x + 3x² - 8) + (-15x - 4)
(3x²) + (10x - 15x) + (-8 - 4)
(3x2 - 5x - 12)
Quadratic equations are the polynomial equations of degree 2 in one variable of type f(x) = ax2 + bx + c = 0 where a, b, c, ∈ R and a ≠ 0.
Learn more about Quadratic equations here: brainly.com/question/1214333
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