exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

(x-5)(3x + 4)=0 is:

I am not using a specific book. I am just practicing...

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exam Other Question

Jackie has coffee that sells for $9 per pound and coffee that sells for $4 per pound. How many pounds of each must be mixed to get 20 pounds that sells for $8.25 per pound? i need help with the process of multipling out polynomials any help would be greatly appreciated!!!!