SOLUTION: The graph of y=-2x^2 + 15x + c contains (3, 89). Find the value of c. A. 50 B. 62 C. 26 D. none of these

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: The graph of y=-2x^2 + 15x + c contains (3, 89). Find the value of c. A. 50 B. 62 C. 26 D. none of these      Log On


   

Question 600984: The graph of y=-2x^2 + 15x + c contains (3, 89). Find the value of c.
A. 50
B. 62
C. 26
D. none of these
Found 2 solutions by lynnlo, Earlsdon:
Answer by lynnlo(4176) About Me  (Show Source):
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
y+=+-2x%5E2%2B15x%2Bc Contains the point (3, 89).
To find the value of c, substitute x = 3 and y = 89, then solve for c.
89+=+-2%283%5E2%29%2B15%283%29%2Bc Simplify.
89+=+-18%2B45%2Bc
89+=+27%2Bc Subtract 27 from both sides.
62+=+c
Answer B. is correct.