Question

-21/3 + 18/3 find the value of​

Answer 1

Answer:

Solution

Correct option is B)

Now if we look at the denominator, it is a simple binomial expansion of (3+2)

6

The numerator is 18

3

+7

3

+3.18.7.25

where,

18

3

+7

3

=(18+17)

3

−3.18.17(18+17) using (a+b)

3

=a

3

+b

3

+3ab(a+b)

So the numerator becomes,

=(25)

3

−3.18.17(25)+3.18.7.25

=(5

2

)

3

=5

6

So the expression in the question will be,

5

6

5

6

=1

Answer 2

Answer:

We will get the value of $\frac{-21}{3} +\frac{18}{3} =-1.$

Step-by-step explanation:

• As per the question we have to evaluate the given data.

        Given data:- $\frac{-21}{3} +\frac{18}{3} .$

        To find:- Value of $\frac{-21}{3} +\frac{18}{3} .$

        Solution:-

• We will take the LCM of the denominators, and make denominators the same.

• We will Convert the given fractions to equivalent fractions with the denominator as the LCM.

• Adding the numerators over the denominators.

       Therefore,

        $\frac{-21}{3} +\frac{18}{3} \\\\=\frac{-21+8}{3}\\\\=\frac{-3}{3}\\\\=-1$

      The question is to find the value of $\frac{-21}{3} +\frac{18}{3} .$