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zavuch27 [327]
3 years ago
14

Two square roots for 25/4

Mathematics
1 answer:
Mila [183]3 years ago
6 0

Answer:

\large\boxed{\pm\dfrac{5}{2}=\pm2.5}

Step-by-step explanation:

\sqrt{a}=b\iff b^2=a\\\\\pm\sqrt\dfrac{25}{4}}\qquad\text{use}\ \sqrt{\dfrac{a}{b}}=\dfrac{\sqrt{a}}{\sqrt{b}}\\\\=\pm\dfrac{\sqrt{25}}{\sqrt{4}}=\pm\dfrac{5}{2}=\pm2.5\\\\\text{because}\\\\\left(\dfrac{5}{2}\right)^2=\dfrac{25}{4}\ \text{and}\ \left(-\dfrac{5}{2}\right)^2=\dfrac{25}{4}

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