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 − 15 + 4 = −2

Answer 1

For x = −3,

x² − 5x + 4 = (−3)² − 5 (−3) + 4 = 9 + 15 + 4 = 28