Advertisements
Advertisements
Question
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
Advertisements
Solution
For x = −3,
x2 + 5x + 4 = (−3)2 + 5 (−3) + 4 = 9 − 15 + 4 = 13 − 15 = −2
RELATED QUESTIONS
Find and correct the errors in the statement: 4(x − 5) = 4x − 5
Find and correct the errors in the statement: (2x)2 + 4(2x) + 7 = 2x2 + 8x + 7
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 gives (−3)2 + 5 (−3) = −9 − 15 = −24
Find and correct the errors in the statement: (y − 3)2 = y2 − 9
Find and correct the errors in the statement: (2a + 3b) (a − b) = 2a2 − 3b2
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`
Identify the errors and correct them
6xy + 3xy = 9x2y2
Identify the errors and correct them
– 3p2 + 4p – 7 = – (3p2 + 4p – 7)
