Question

Write the equation of the quadratic function with roots -10 and -8 and a vertex at (-9, -3).

Answer 1

@myininaya

Answer 2

@ganeshie8

Answer 3

Take the coordinates of the three points given and make 3 equations. Here's the one for the vertex:
\[-3=(-9)^{2}a-9b+c\]

Answer 4

FINALLY someone... but i dont get it :/

Answer 5

\[y=ax ^{2}+bx+c\]

Each of the points (the vertex and the two x-intercepts) give you 3 points
(-9,-3) (-10,0) and (-8,0). Use each of the (x,y) points to produce 3 equations, then solve them for a, b, and c.