exam Maths Puzzle Numerical Ability

Solving 6x^2+3x-18=0,using quadratic formula. would that be ax^+bx+c=0.

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exam Other Question

List and verify two intercept points (ordered pairs) that are solutions for the equation 5x - 4y = 20?
Please help me solve this problem:
the direction are as follow: Find the domain of the function, use interval notation:

f(x)= 3 divided by (x+4)