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Alex
2 years ago
15

Plsss if you can find x

Mathematics
1 answer:
Vikki [24]2 years ago
4 0

Answer:

x=15

Step-by-step explanation:

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Step-by-step explanation:

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Solve the following quadratic equation.<br><br> 3(x + 5)^2 = 60
RoseWind [281]

To solve this equation we could use:


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There will be:


3(x + 5)^2 = 60\qquad|:3\\\\(x+5)^2=20\\\\(x+5)^2=\big(\sqrt{20}\big)^2\\\\ (x+5)^2=\big(\sqrt{4\cdot5}\big)^2\\\\(x+5)^2=\big(\sqrt{4}\cdot\sqrt{5}\big)^2\\\\(x+5)^2=\big(2\sqrt{5}\big)^2\\\\(x+5)^2-\big(2\sqrt{5}\big)^2=0\\\\ (x+5+2\sqrt{5})(x+5-2\sqrt{5})=0\\\\\\x+5+2\sqrt{5}=0\qquad\vee\qquad x+5-2\sqrt{5}=0\\\\\boxed{x=-5-2\sqrt{5}\qquad\vee\qquad x=-5+2\sqrt{5}}

6 0
3 years ago
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