book Maths Puzzle Numerical Ability

Mary bought two computers, one desktop and one laptop. Before finance charges, the laptop cost $1500. more than the desktop. Mary paid for the computers using two different financ

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please help me solve the following quadratic equations by factorisation;
1.3x^2+11x-4=0
2.x^2+5x-6=0
3.4x^2+14x+6=0
4.3x^2-5x-2=0
5.3x^2-5x+2=0
6.5x^2-14x-3=0 Five times the opposite of a number was increased by 25. This was 90 times greater than 8 times the number. What was the number?