Q1 of 105 Page 280

Find the errors and correct the following mathematical sentences

Substitute x = – 3 in


(b) x2– 5x + 6 = (–3)2 –5 (–3) + 6 = 9 – 15 + 6 = 0

If LHS is


x2– 5x + 6


Then RHS would be


⇒ x2– 5x + 6


Putting x = (-3)


= (–3)2 –5 (–3) + 6


= 9 + 15 + 6


= 30


The error is + 15 instead of (-15) and end results to 30 instead of 0


Hence putting x = (-3) in x2– 5x + 6 results to 30


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