Q. 225.0( 2 Votes )

Choose the correc A. –2x + 9 for all xϵ R

B. 2x – 9 if 4 < x < 5

C. –2x + 9 if 4 < x < 5

D. none of these

Answer :

f(x) = |x2 – 9x + 20|

= |x2 – 4x – 5x + 20|


= |x(x – 4) – 5(x – 4)|


f(x) = | (x –5) (x – 4) |



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