exam Maths Puzzle Numerical Ability

please help with this last one.

Solve the quadratic equation by factoring

2x^2 = 19x + 33

thanks

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exam Other Question

Determine the slope of each line or linear function from the given information:

f(x)=0.5x+8 I believe I am using the wrong formula?
Three children can get 1 box of cereal from the grocery store there are 12 boxes, how many ways can the selection be made?