Book Maths Puzzle Algebra

How do you solve "4y to the 4th power minus 13y squared plus 9 equals 0" using substitution to factor?

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Book Other Question

How do you solve "n to the 6th power minus 7n to the 3rd power minus 8 equals 0" using substitution to factor? 22 ft x 8 ft sidewalk, 22 stepping stones 16 in x 16 in, 2 inches in depth, gravel cost is 2.99 a cubic foot. How many bags of gravel will it take? what is the total cost of the gravel? Round to the nearest decimal.