Solve a ^2 -a -1 - ScanMath

If a negative sign or a subtraction symbol appears outside parentheses, remove the parentheses and change the sign of every term within the parentheses

1 + 4

Add the numbers

5

a = \frac{1 \pm 5}{2}

Separate the equation into 2 possible cases

a = \frac{1 + 5}{2} a = \frac{1 - 5}{2}

Solution

a_{1} = \frac{1 - 5}{2}, a_{2} = \frac{1 + 5}{2}

Alternative Form

a_{1} \approx - 0.618034, a_{2} \approx 1.618034

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