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15-03-2017
Mathematics

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The diagonal of a tv is 39 inches. it's length is 21inches more than the height. find the dem

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15-03-2017

h² + l² = 39²
h² + (h+21)² = 39²
h² + h² + 42h + 441 = 1521
2h² + 42h + 441 - 1521 = 0
2h² + 42h - 1080 = 0
h² + 21h - 540 = 0
h² + 36h - 15h - 540 = 0
h(h+36) -15(h+36) = 0
(h+36)(h-15)=0

h = 15inch
l = 15+21 = 36 inch

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