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  • find and correct the errors in the following mathematical statements Substituiting x=- 3 in x ^2+5 x +4 gives -3^ 2 +5 (-3 )+ 4 = 9 + 2 plus 4 = 15

Find and correct the errors in the following mathematical statements

Q10) Substituting x = -3 in 

a)

x ^ 2 + 5 x + 4 \: \: gives \: \: ( -3 ) ^ 2 + 5 ( -3 ) + 4 = 9 + 2 + 4 = 15

Answers (1)

best_answer

 

We need to substitute  x = -3 in 

 x^{2}+5x+4
  =(-3)^{2}+5(-3)+4
  = 9 - 15 + 4
   = -2 \neq 15

so the given statement is wrong
Correct statement is   (-3)^{2}+5(-3)+4= -2

Posted by

Gautam harsolia

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