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Solve the following quadratic equations using quadratic formula x²+x-1=0 |
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Answer» Answer: Step-by-step explanation: x=1.62 or x=−0.62 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+√52 or 1−√52 x=1.62 or x=−0.62 hope it's helpful ^_^ |
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