book Maths Puzzle Numerical Ability

x^2+3x-28=0

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you r selling stuffed animals4 $6. u sold 6 more rabbits then monkeys.if u sold $120 dollars worth of stuffed animals how many of each type did u sell. i calculated 13 rabbits wer Im learning about factoring Trinomials by grouping and there is one problem I am having some trouble with. its 4r2(the 2 is the exponent) + 3r - 10