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Mina
Mathematics
22 January, 19:38
What is the solution to x^2 = 121?
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Bryanna Murphy
22 January, 19:54
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Answer: {11, - 11}
Step-by-step-explanation: To solve for x in this equation, since x is squared, we simply take the square root of both sides of the equation to get x by itself.
It's important to remember however that when taking the square root of both sides of an equation, we always use plus or minus.
In other words in this problem, since x² = 121,
x = + or - 11.
A common mistake is to say that x is just equal to 11. But notice that if you plug a - 11 back into the original equation, it also checks.
So our answer to this problem is {11, - 11}.
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