Question

alpha plus beta is equal to 9 and alpha into beta is equal to 1/9 find 1/alpha plus 1/b eta minus alpha into beta

Answer 1

$\alpha + \beta = 9 \\ \alpha \beta = 1 \div 9 \\ 1 \div \alpha + 1 \div \beta - \alpha \beta = \alpha + \beta \div \alpha \beta - \alpha \beta = 9 \div 1 \div 9 - 1 \div 9 = 81 - 1 \div 9 = 729 - 1 \div 9 = 728 \div 9(answer)$
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