Originally Posted by

**bubbles73** Equations

1. 10 = 121a+11b+c

2. x = -b/2a

3. 35 = -b^2/4a + c

4. b = 4.8233-22a

There are 4 unknowns and 4 equations. After numerous attempts of trying to find a i could really use some help. The actual value of a is -0.233 or part there of. Here is my best attempt, i cant see where i went wrong.

equation 3. c = 35 + b^2/4a

10= 121a+11b+35+b^2/4a

10=121a+53.0563-242a+35+ (9.6466-212.2252+484a^2 all over 4a) You multiplied 4.8233 by 2 instead of squaring it. Should be 23.26422289.

40a = 212.2252a-484a^2+140a+9.6466-212.2252a+484a^2

40a=140a+9.6466

100a= - 9.6466

a = -0.096466