book Maths Puzzle Numerical Ability

Quadratic Equations:

3x^2 + 2x -8 = 0 and 5x^2 + 7x = 12

I can't seem to get these worked out! Any help is appreciated!

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book Other Question

1) The expression x5 means,....
2) Inthe expression xn, n is called the,... and x is called the,.... At 10:00am two cars leave the same location and travel in opposite directions. One car's speed is 50 mi/h, while the other's speed is 55 mi/h. At what time are the cars 273 miles