exam Maths Puzzle Numerical Ability

what is

n x-2 -5
he is studying functions with algebra
he is first year secondary school
many thanks

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exam Other Question
Soybean meal is 16% protein, cornmeal is 8% protein. How many pounds of each should be mixed togeather in order to get a 320 lb mixture that is 14% protein?

Soybean=

Coenmeal= solve by completing the square. 4x²+2x-3=0