exam Maths Puzzle Numerical Ability

What is the discriminant of (3x+2)x=4-2x? I think the answer is 64 but I need an explaination . Please help me :)

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exam Other Question

A rectangular piece of tin 40cm by 30cm is to be made into an open box with a base of 900cm cubed by cutting equal squares from the four corners and then bending up the sides. Find What is the equation of a line going through points (0,5) (6,2)? Please and thank you.