Question

Solve by using quadratic formula : x2

-3x+1=0
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Answer 1

answer

x=1.62orx=−0.62

Step-by-step explanation:

The quadratic formula is −b±√b2−4ac2a

this is used for formulas ax2+bx+c=0

in your problem,  x2−x−1=0  a=1, b=-1, c=-1#

substitute into quadratic  −(−1)±√(−1)2−4(1)(−1)2⋅1

this equals  1±√1+42

1+√52or1−√52

x=1.62orx=−0.62