book Maths Puzzle Numerical Ability

i have this equation for hw but i dont know how to solve it can u help me please? its



x
- +2=4
2

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book Other Question
please help me solve this question
122 liters to milliters I need to know how the signs of A and C (in the quadratic equation: Ax^2+bx+c=0) provide clues as to the number of possible solutions in a quadratic equation.


Thanks in advance!