Question

Sendo a função F( x ) = - 2x² – x + 15, quanto vale F( - 2 ) - F ( 4 ) 5.

Answer 1

F( x )= -2x²-x + 15

F(-2)=-2×(-2)²-(-2)+15

F(-2)= -2×4+2+15

F(-2)=-8+2+15

F(-2)=15-6

F(-2)=11

F( 4 )= -2×4²-4+15

F( 4 )=-2×16+15

F( 4 )=-32+15

F( 4 )=-17

F(-2)-F( 4 )

11-(-17)=11+17==>28