Simplify 2 square root of 13
how do i get this to 7.21
The Correct Answer and Explanation is:
To simplify ( 2 \sqrt{13} ) and approximate it to a decimal value, we first need to understand the steps involved in calculating square roots and the properties of square roots.
Step 1: Understand Square Roots
The square root of a number ( x ) is a value ( y ) such that ( y^2 = x ). For instance, the square root of 4 is 2 because ( 2^2 = 4 ). In this case, ( 13 ) is not a perfect square, which means that ( \sqrt{13} ) will not yield an integer but rather an irrational number.
Step 2: Calculate ( \sqrt{13} )
To find ( \sqrt{13} ), we can use a calculator or estimate its value. Knowing that ( 3^2 = 9 ) and ( 4^2 = 16 ), we can determine that ( \sqrt{13} ) is between 3 and 4.
Using a calculator, we find that:
[
\sqrt{13} \approx 3.60555
]
Step 3: Multiply by 2
Now, we need to multiply ( \sqrt{13} ) by 2 to find ( 2 \sqrt{13} ):
[
2 \sqrt{13} = 2 \times 3.60555 \approx 7.2111
]
Step 4: Rounding
Rounding ( 7.2111 ) to two decimal places gives us approximately ( 7.21 ).
Conclusion
Thus, the expression ( 2 \sqrt{13} ) simplifies to approximately ( 7.21 ). The process involved understanding the square root of a non-perfect square and applying basic arithmetic to obtain a decimal approximation. This approximation can be useful in various applications, such as engineering, physics, and mathematics, where exact values are often impractical or unnecessary, and approximations suffice for analysis or calculations.