Answer:
Step-by-step explanation:
y = x² + x - 3
x = - 3
y = ( - 3 )² + ( - 3 ) - 3 = 3
( - 3 , 3 )
x = 0 ⇒ y = - 3
( 0 , - 3 )
x = 1
y = ( 1 )² + ( 1 ) - 3 = - 1
( 1 , - 1 )
(b). Coordinate x of the vertex of quadratic equation y = ax² + bx + c is
- [tex]\frac{b}{2a}[/tex]
x = - [tex]\frac{1}{2(1)}[/tex] = - [tex]\frac{1}{2}[/tex] = - 0.5
y = ( - 0.5 )² + ( - 0.5 ) - 3 = - 3.25 = - 3[tex]\frac{1}{4}[/tex]
( - [tex]\frac{1}{2}[/tex] , - 3[tex]\frac{1}{4}[/tex] )
