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If 2x + 3y =13and xy =4.find the value of 8x^3+27y^3 |
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Answer» Sincere apologies for the inconvenience caused. 2x +3y = 13-----(1) 8x³ +27y³ = (2x)³ +(3y)³ = (2x+3y)³ - 3*2x*3y(2x+3y) [USING (a+b)³ = a³+b³+3ab(a+b)] = (13)³- 18 * 6 *13 [ using (1) and (2)] = 2197 - 1404 =793 |
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