Factorisation - Solutions 4

CBSE Class –VIII Mathematics
NCERT Solutions
CHAPTER - 14
Factorisation (Ex. 14.4)

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Find and correct the errors in the following mathematical statements:

1.      

Ans. L.H.S. = R.H.S.

Hence the correct mathematical statement is 

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2. 

Ans. L.H.S. = R.H.S.

Hence the correct mathematical statement is 

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3.  

Ans. L.H.S. = R.H.S.

Hence the correct mathematical statement is 

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4. 

Ans. L.H.S. = R.H.S.

Hence the correct mathematical statement is 

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5. 

Ans. L.H.S. = R.H.S.

Hence the correct mathematical statement is 

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6. 

Ans. L.H.S. = R.H.S.

Hence the correct mathematical statement is 

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7.  

Ans. L.H.S. = R.H.S.

Hence the correct mathematical statement is 

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8. 

Ans. L.H.S. = R.H.S.

Hence the correct mathematical statement is 

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9. 

Ans.

L.H.S. = .

Hence the correct mathematical statementsis 

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10. Substituting  in:

(a) gives

(b) gives

(c) gives

 Ans. (a) L.H.S. = 

Putting  in given expression,

 = R.H.S.

Hence  gives 

(b) L.H.S. = 

Putting  in given expression,

 = R.H.S.

Hence  gives 

(c) L.H.S. = 

Putting  in given expression,

 = R.H.S.

Hence  gives 

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11. 

Ans. L.H.S. =     

= R.H.S.

Hence the correct statement is 

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12. 

Ans. L.H.S. =  

=  

Hence the correct statement is 

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13.  

Ans. L.H.S. =  

=  

= R.H.S.

Hence the correct statement is 

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14. (a + 4) (a + 2) = a2 + 8

Ans. L.H.S. = 

= R.H.S.

Hence the correct statement is 

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15.    

Ans. L.H.S. = 

 = R.H.S.

Hence the correct statement is 

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16. 

Ans. L.H.S. = R.H.S.

Hence the correct statement is 

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17. 

Ans. L.H.S. =  

= R.H.S.

Hence the correct statement is .

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18. 

Ans. L.H.S. = R.H.S.

Hence the correct statement is 

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19.   

Ans. L.H.S. = R.H.S.

Hence the correct statement is 

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20. 

Ans. L.H.S. = R.H.S.

Hence the correct statement is 

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21. 

Ans. L.H.S. = R.H.S.

Hence the correct statement is