Solve for x_1
x_{1}=3
Assign x_1
x_{1}≔3
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x_{1}=\frac{-15+21}{2}
Calculate the square root of 441 and get 21.
x_{1}=\frac{6}{2}
Add -15 and 21 to get 6.
x_{1}=3
Divide 6 by 2 to get 3.
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