book Maths Puzzle Numerical Ability

-5x-10=2-(x+4)

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Find (a) hte discriminant, (b) the number of solutions and (c) the nature of the solutions for 5x^2-7x-4=0 A DEALER SELLS BOOKS AT 40% ABOVE COST. hOW MUCH DOES A DEALER PAY FOR A SHIPMENT OF 6 DOZEN BOOKS THAT HE SELLS FOR $7 PER BOOK?