exam Maths Puzzle Numerical Ability

16-20 EVEN DIRECTIONS:
FIND THE DISCRIMINANTOF THE QUADRATIC EQUATION, PUT IT IN STANDARD FORM!

16) 5X^2+3X=12

18)7-5X^2+9X=x

20)2x-x^2=x

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okay i am having problems solving this one its easy i know i must be missing a step -[3x-(2x+5)=-4[3(2x-4)]-3x Mark is 3 years older than Jane. In 4 years, Mark will be 1.5 times as old as Jane. How old is Mark now?