book Maths Puzzle Numerical Ability

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?

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book Other Question

How do you find the vertex and intercepts for

y = x^2 -6x

and how do you graph it?

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