exam Maths Puzzle Numerical Ability

(rad)x-1)=x-3 i know I square them first but then i get lost. please help me.

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exam Other Question

Minimizing cost.

A company uses the formula C(x)=0.02x2-3.4x+150 to model the unit cost in dollars for producing x stabilizer bars. For what number of bars is the unit cost at its minimum? What is the unit cost at that level of production. What is -3 (2y - 9) + y simplified?