Advertisements
Advertisements
Question
Find and correct the errors in the statement: (y − 3)2 = y2 − 9
Advertisements
Solution
L.H.S = (y − 3)2 = (y)2 − 2(y)(3) + (3)2 [(a − b)2 = a2 − 2ab + b2]
= y2 − 6y + 9 ≠ R.H.S
The correct statement is (y − 3)2 = y2 − 6y + 9
RELATED QUESTIONS
Find and correct the errors in the statement: x(3x + 2) = 3x2 + 2
Find and correct the errors in the following mathematical statement. Substituting x = −3 in
x2 + 5x + 4 gives (−3)2 + 5 (−3) + 4 = 9 + 2 + 4 = 15
Find and correct the errors in the following mathematical statement. Substituting x = −3 in
x2 − 5x + 4 gives (−3)2 − 5 (−3) + 4 = 9 − 15 + 4 = −2
Find and correct the errors in the following mathematical statement. Substituting x = −3 in x2 + 5x gives (−3)2 + 5 (−3) = −9 − 15 = −24
Find and correct the errors in the statement: (a + 4) (a + 2) = a2 + 8
Find and correct the errors in the statement: `(4x + 5)/(4x) = 5`
Find and correct the errors in the statement: `(7x + 5)/5 = 7x`
Identify the errors and correct them
(4n)2 – 2n + 3 = 4n2 – 2n + 3
Identify the errors and correct them
(x – 2)(x + 3) = x2 – 6
Identify the errors and correct them
– 3p2 + 4p – 7 = – (3p2 + 4p – 7)
