exam Maths Puzzle Numerical Ability

3x^2 + 2x = 7


x^2 + 8x+9=-7



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exam Other Question
A motorboat travels 120km upstream and then 120km downstream in a total of seven hours. If the speed of the river's current is 5km/h,then what is the speed of the motorboat in stil How many real roots and or imaginary roots does the following equation have:

x^2 - 625 = 0

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