標題:
Math. problems!!!
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發問:
1. A banner is in the shape of a right triangle with an area of 63 m^2. the height if the banner is 5m less than twice the width of the banne. find the height and width of the banner.2.an open box with height 1 m has a length that is 2 m greater than its width. the box was made with minimum waste from an 80m^2... 顯示更多 1. A banner is in the shape of a right triangle with an area of 63 m^2. the height if the banner is 5m less than twice the width of the banne. find the height and width of the banner. 2.an open box with height 1 m has a length that is 2 m greater than its width. the box was made with minimum waste from an 80m^2 rectangular sheet of material. what were the dimensions of the sheet of material? explain in details please!!!
最佳解答:
1. A banner is in the shape of a right triangle with an area of 63 m^2. the height if the banner is 5m less than twice the width of the banne. find the height and width of the banner. Let width = x m 63 = (1/2)(x)(2x-5) 126 = 2x^2 - 5x 2x^2 -5x -126 = 0 x = {5 + sqroot[(-5)^2 - 4(2)(-126)]} / [2(2)] or x = {5 - sqroot[(-5)^2 - 4(2)(-126)]} / [2(2)]
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