2
Question
Find and correct the errors in the statement: (z + 5)2
= z2 + 25
Find and correct the errors in the statement: (z + 5)2 = z2 + 25
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Solution
L.H.S = (z + 5)2 = (z)2 +
2(z)(5) + (5)2 [(a + b)2 =
a2 + 2ab + b2]
= z2 + 10z + 25 ≠ R.H.S
The correct statement is (z + 5)2 = z2
+ 10z + 25
L.H.S = (z + 5)2 = (z)2 + 2(z)(5) + (5)2 [(a + b)2 = a2 + 2ab + b2]
= z2 + 10z + 25 ≠ R.H.S
The correct statement is (z + 5)2 = z2 + 10z + 25
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