Mathematics
Grade-8
Easy

Question

Compare and write <, > or =
square root of 15 plus 2 left parenthesis space right parenthesis 5 plus square root of 15

  1. <
  2. >
  3. =
  4. None of the above

hintHint:

A number's square root is a value that, when multiplied by itself, yields the original number. The other way to square an integer is to find its square root. Squares and square roots are hence linked ideas.
Here we have given two expressions and we have to put the comparison sign for that.

The correct answer is: <


    So the expression which is provided is:
    square root of 15 plus 2 space left parenthesis space space right parenthesis space 5 plus square root of 15
space
    Now we have to put the sign out of greater than, less than and equal to. Before that we need to simplify the terms.
    Squaring both the expressions, we get:
    left parenthesis square root of 15 plus 2 right parenthesis squared space left parenthesis space space right parenthesis space left parenthesis 5 plus square root of 15 right parenthesis squared space
    Here we will use the formula:
    left parenthesis a plus b right parenthesis squared equals a to the power of 2 end exponent plus 2 a b plus b squared
    Expanding it, we get:
    left curly bracket left parenthesis square root of 15 right parenthesis squared plus 2 cross times square root of 15 cross times 2 plus left parenthesis 2 right parenthesis squared space right curly bracket space left parenthesis space space right parenthesis space left curly bracket left parenthesis 5 right parenthesis squared plus 2 cross times 5 cross times square root of 15 plus open parentheses square root of 15 close parentheses squared space right curly bracket
    Simplifying it, we get:
    15 plus 4 square root of 15 plus 4 space left parenthesis space space right parenthesis space 25 plus 10 square root of 15 plus 15
19 plus 4 square root of 15 space left parenthesis space space right parenthesis space 40 plus 10 square root of 15
19 plus 4 square root of 15 space left parenthesis space space right parenthesis space 40 plus 4 square root of 15 plus 6 square root of 15
    Cancelling 4 square root of 15 from both sides, we get:
    19 space left parenthesis space space right parenthesis space 40 plus 6 square root of 15
    Here we can see that clearly Right hand side term is greater than left term.
    So: square root of 15 plus 2 space left parenthesis space less than space right parenthesis space 5 plus square root of 15
space

    Here we used the concept of square root. With the help of that we simplified the given terms from both sides using the algebraic formula and then found out the correct sign that needs to be there!  square root of 15 plus 2 space left parenthesis space less than space right parenthesis space 5 plus square root of 15
space

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