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lara31 [8.8K]
3 years ago
8

Find the number of solutions of the equation. 0 = x2 + 2x + 9

Mathematics
1 answer:
Aloiza [94]3 years ago
4 0
x^2+2x-9=0\\
\Delta=2^2-4\cdot1\cdot(-9)=4+36=40\ \textgreater \ 0\Rightarrow\text{two solutions exist}
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Multiply through row 3 by 1/5:

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Add -2(row 3) to row 1, and add 3(row 3) to row 2:

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