book Maths Puzzle Numerical Ability

I need to know if I am right on this question, Find the legal values of b in the fraction.

2b^2+3b-10
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b^2-2b-8

I think the answer is b=-5, -2, 2 and 4

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book Other Question

Irma invested some money a 7% and $100 less than that at 8%. Her total interest was $58. How muc did she invest at 7%, rounded to the nearest dollar? Rationalize the denominator of -4/ 1+ the sqaure root of 3