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?

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