book Maths Puzzle Numerical Ability

i am having trouble with a problem where i have to find the equation of a line. the problem read...
consider two different nonvertical lines.
L1: A1x + B1y = C1 and L2: A2x + B

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book Other Question
apply the quadratic formula to find the roots of the given function, and then graph the function.

g(x) = x^2 + x + 12 {x^2-3}=2x graphing to verify your solution