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If the square of a plus 2 times a equals 1, then what is the square of 2A plus 4 times a?
a²+2a=1
Double two on both sides
2a²+4a=2
A cube wooden box, its edge length is 0.8 meters, how many square meters of wood board is needed to make this wooden box?
To make a formula,
Required area = 0.8 * 0.8 * 6 = 3.84 M2
A wooden case without cover is 15 cm long, 11 cm wide, 8 cm high and 1 cm thick. How to calculate the volume of a wooden case
(15-2) * (11-2) * (8-1) = 819 (cm3)
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