exam Maths Puzzle Numerical Ability

I still cant figure out the answer to this question even with this website. The question is: Solve by using te quadratic formula. 5x^2+4x-7=0

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exam Other Question

The problem is:

[(3y-4)/(49-y^2)] + [(2y+1)/(y-7)]

I know i need to find the LCD but somehow my answer doesnt match the one in the back of the book. My answer is (2y^2+18y-3)/[(y-7)(y+7)]. Can you please help me! Thank you! "A" and "B" start from the same point and travel along the road that are right angles to each other. "A" travels 3 miles an hour faster than "B". At the end of 2 hours, they are 30 miles apart. Find their rates.