FUNCTIONS -I1

 If f(x) = |2x - 10| evaluate f(-70)

 

Solution

 

f(x) = |2x - 10|

 

f(-70) = |(2 x -70) - 10|

 

f(-70) = |-140 - 10|

 

f(-70) = |-150| = 150 (since any number out of absolute signs is +ve).

 

Hence f(-70) = 150

 

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

 

If f(x) = |5x - 300| evaluate f(-60)