Question 448999
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi,
find the Quadratic(ax^2 + bx + c = 0), Given 3 points
f(3)= -11
f(1)= -3
f(-2)= -21
 9a + 3b + c = -11 
  a + b + c = -3
 4a  -2b + c = -21
  a = -2, b = 4, c = -5
 -2x^2 +4x -5 = 0

*[invoke cramers_rule_3x3 9,3,1,-11,1,1,1,-3,4,-2,1,-21]