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Home » Square and add the equations: - Dyverse

Square and add the equations: - Dyverse

📅 March 9, 2026 👤 scraface

Mar 09, 2026

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📌 \boxed{2520}Question: An industrial designer creates a series of modular shelves where each shelf has 4 more panels than the previous one. If the first shelf has 7 panels, how many shelves can be built with a total of 150 panels?

📌 Solution: Let the number of shelves be \( n \). The number of panels forms an arithmetic sequence: 7, 11, 15, ..., with first term \( a = 7 \) and common difference \( d = 4 \). The sum of the first \( n \) terms is:

📌 S_n = \frac{n}{2} \left(2a + (n - 1)d\right) = \frac{n}{2} \left(2(7) + (n - 1)(4)\right) = \frac{n}{2} (14 + 4n - 4) = \frac{n}{2} (4n + 10)

📌 Set this equal to 150:

📌 \frac{n}{2} (4n + 10) = 150 \implies n(4n + 10) = 300 \implies 4n^2 + 10n - 300 = 0

📌 Divide by 2: \( 2n^2 + 5n - 150 = 0 \). Use the quadratic formula:

📌 n = \frac{-5 \pm \sqrt{5^2 - 4(2)(-150)}}{2(2)} = \frac{-5 \pm \sqrt{25 + 1200}}{4} = \frac{-5 \pm \sqrt{1225}}{4} = \frac{-5 \pm 35}{4}

📌 Take the positive root: \( n = \frac{30}{4} = 7.5 \). Since \( n \) must be an integer, the largest possible \( n \) is 7. Check \( S_7 \):

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