Answer:
x² = 17² - 8²
Explanation:
Pythagoras theorem
Diagonal ² = length² + width²
Rearrange to get length in its own
Length ² = diagonal ² - width²
Replace length with x, diagonal with 17 and width with 8
x^2= 17^2-8^2
just do reverse PEMDAS on the Pythagorean Theorem
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