Question

If A square minus 4A minus 1 =0 and a is not equal to 0 find the value of a - 1 by A .​

Answer 1

${a}^{2} - 4a - 1 = 0 \\ {a}^{2} - 4a = 1 \\ {a}^{2} - 4a + 4 = 1 + 4 \\ {(a - 2)}^{2} = 5 \\ a - 2 = ± \sqrt{5} \\ a = 2 ± \sqrt{5}$

Therefore,

$\frac{a - 1}{a} \\ = \frac{2 ± \sqrt{5} - 1 }{2 ± \sqrt{5} } \\ = \frac{1 ± \sqrt{5} }{2 ± \sqrt{5} }$

Answer 2

Answer:

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Step-by-step explanation:

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