book Maths Puzzle Numerical Ability

If f( x ) = 5x+3 and g ( x ) = x^2-3 for what val;ue of x is f( x )= g( x )?

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Calculate the value of (b� - 4ac) in the equation "9x� + 12x + 16 = 0" and state how many real solutions this equation has. What are they? A 1000 L tank now contains 240 L of water. How long will it take to fill the tank using a pump that pumps 25 L per minute?