Need help plz on number 2

1 answer:

Inga [223]2 years ago

7 0

Answer is 5

Step-by-step explanation:

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$\large\boxed{b=\pm\sqrt{77}}$

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$b^2=77\iff b=\pm\sqrt{77}\\\\\text{because}\\\\(-\sqrt{77})^2=77\ \text{and} \ (\sqrt{77})^2=77$

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