Question

What is the vertex of this quadratic function? f(x) = 2x2 + 4x − 5

Answer 1

V( - b / 2a ; (4ac - b^2) / 4a ) ;
a = 2 ; b = 4 ; c = - 5 ;
V( - 4 / 4 ; - 56 / 8 );
finally, V ( - 1 ; - 7 ) ;