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B = 2H - 3; (B x H)/2 = 10 ie B x H = 20;

2H2 - 3H - 20 = 0

(H - 4)(2H + 5) = 0

Only positive value for H is 4, making B = 5 cm

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Q: The base of a triangle is 3 cm less than twice its height if the area is 10 cm2 find the lenght of the base?
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