Question 816295
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Hi,
Find the equation for a parabola that passes through (-2,-34), (4,2), and (6,-18) using matrices. 
The idea is to find a,b,c in the general form: y = ax^2 + bx + c
Substituting x values with appropriate y values Gives
 4a -2b + c = -34
 16a + 4b + c = 2
 36a + 6b + c = -18
a = -2, b = 10, c = -6   parabola is {{{y = -2x^2 + 10x - 6}}}
*[invoke cramers_rule_3x3 4,-2,1,-34,16,4,1,2,36,6,1,-18]