Square roots and Cube roots

Square roots and Cube roots

Learn and practice Problems on logarithm with easy Square roots and Cube roots and shortcut tricks. All questions and answers on Square roots and Cube roots covered for various Competitive Exams.

Solve Problems:

  1.  80=This image has an empty alt attribute; its file name is 031.png
  1. 3.74
  2. 149.67
  3. 196
  4. 225
View Answer

Answer: C

Explanation:

This image has an empty alt attribute; its file name is 031.png= 80

∴ ?=142= 14 × 14 = 196

2) Value of 

  1. 5
  2. 2
  3. 3
  4. suare root 2
View Answer

Answer: B

Explanation:

As we know, (a+b) (a-b) = a2 ?b2

By using above formula:

=

=

= 5-3=2

3)

  1. 2
  2. 2
  3. 6
  4. 5
View Answer

Answer: B

Explanation:

4) What should come in place of the question marks (?) in the following equation?

  1. 54
  2. 68
  3. 64
  4. 48
View Answer

Answer: C

Explanation:

128 × 32= ? × ?= ?2

=8 × 2 × 4=64

5)=?

  1. 9
  2. 0.9
  3. 99
  4. 0.95
View Answer

Answer: D

Explanation:

Since the sum of decimal places in denominator and numerator under the radical sign is equal, hence we can remove the decimal places.

6)=?

  1. 1
  2. 2
  3. 4
  4. 3
View Answer

Answer: B

Explanation:

Let x =

x =

= x2 = 2 + x

= x2 – 2 – x = 0

= x2 -(2-1) x – 2 = 0

= x2 – 2x + x – 2 = 0

= x (x – 2) + 1 (x – 2) = 0

= (x – 2)(x + 1) = 0

= x = 2, x = -1

Solution 2:

In case of same type root values addition break the given number in consecutive order, the largest number will be the answer i.e., the number is 2, and the consecutive order of two: 1*2 Hence, the answer is 2

7)=?

  1. 30.297
  2. 30.197
  3. 29.097
  4. 30.397
View Answer

Answer: A

Explanation:

=30 + 0.3 – 0.003 = 30.297

8)= 12.3  then x=?

View Answer

Answer: D

Explanation:

5 + x2 = 9

x2 = 9 – 5 = 4

x = 2

View Answer

Answer: B

Explanation:

Similarly,

Now,

10)   =?

  1. 2
  2. 5
  3. 4
  4. 3
View Answer

Answer: A

Explanation:

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