book Maths Puzzle Numerical Ability

the numerator of a fraction is 4 less than the denominator. if both the numerator and the denominator are both increased by 2, the resulting fraction is equivalent to 2.

i dont

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book Other Question
use the quadratic formula to solve the following quadratic equations.

a. 3x^2+2x-8=0

b. 5x^2+7x=12


please help Factor: x^3-5x^2+x+15=0