Question

answer me fast please​

Answer 1

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Answer 2

Answer:

$ab = \frac{11}{4} \:$

$b = \frac{11}{4a}$

$a + b = 6$

$a + \frac{11}{4a} = 6$

$4 {a}^{2} + 11 = 24a$

$4 {a}^{2} - 24a + 11 = 0$

$4 {a}^{2} - 2a - 22a + 11 = 0$

$2a(2a - 1) - 11(2a - 1) = 0$

$a = \frac{11}{2} or \: \frac{1}{2} \: and \: b = \frac{1}{2} or \: \frac{11}{2}$

$so \: 2( {a}^{3} - {b}^{3} ) = 2( { \frac{11}{2} }^{3} - { \frac{1}{2} }^{3} ) = 2( \frac{1331 - 1}{8} ) = 332.5$