FUNCTIONS K2

If f(x) = |x – 10 – x²| evaluate f(-7)

 

Solution

 

f(x) = |x - 10 – x²|

 

f(-7) = |-7 - 10 – (-7)²|

f(-7) = |-17 – (-7)²|      (since -7 - 10 = -17)

 

f(-7) = |-17 – 49|     since (-7)²= 49

 

f(-7) = |-66| = 66 since any number out of absolute signs is +ve.

  

Hence f(-7) = 66

 

TRY THIS..................

 

If f(x) = | x – 60 – x²| evaluate f(-8)