Question

a²-a-2=0 find solution ​

Answer 1

Answer:

${a}^{2} - a - 2 = 0 \\ \\ = > {a}^{2} - (2 - 1)a - 2 = 0 \\ \\ = > {a}^{2} - 2a + a - 2 = 0 \\ \\ = > a(a - 2) + 1(a - 2) = 0 \\ \\ = > (a - 2)(a + 1) = 0 \\ \\ either \: a - 2 = 0 \\ \\ = > a = 2 \\ \\ or \: a + 1 = 0 \\ \\ = > a = - 1$

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Answer 2

Step-by-step explanation:

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