Advertisements
Advertisements
Question
Find and correct the errors in the following mathematical statement. Substituting x = −3 in x2 + 5x gives (−3)2 + 5 (−3) = −9 − 15 = −24
Solution
For x = −3,
x2 + 5x = (−3)2 + 5(−3) = 9 − 15 = −6
APPEARS IN
RELATED QUESTIONS
Find and correct the errors in the statement: 4(x − 5) = 4x − 5
Find and correct the errors in the statement: x(3x + 2) = 3x2 + 2
Find and correct the errors in the statement: 5y + 2y + y − 7y = 0
Find and correct the errors in the statement: 3x + 2x = 5x2
Find and correct the errors in the statement: (2x)2 + 5x = 4x + 5x = 9x
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 statement: (z + 5)2 = z2 + 25
Identify the errors and correct them
(4n)2 – 2n + 3 = 4n2 – 2n + 3
Identify the errors and correct them
– 3p2 + 4p – 7 = – (3p2 + 4p – 7)
