Posted by Anna on Wednesday, September 1, 2010 at 8:45am.
1. 8 + 7x =2x²
I used my calculator to graph this and got
x is about 4.41 and .904
2. 1/3x²  15 = 0
Again, I graphed on my calculator and got x is about 6.70 and 6.70
Are these answers accurate and is there another way to solve?

Math  Solving Graphically  drwls, Wednesday, September 1, 2010 at 9:18am
1. x = (1/4)[7 +/ sqrt(49 + 64)]
= 4.408 or 0.9075
2. (1/3)(x^2 45)= 0
(x+sqrt45)(xsqrt45) = 0
x = +/sqrt(45)= +/ 6.708