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Posted by 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 - , 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)(x-sqrt45) = 0
    x = +/-sqrt(45)= +/- 6.708

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