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I have a great interest in education sector. I have my own way of teaching which varies from student to I have been teaching since last 35 years and it has become my life.

I love teaching and can go to the level of the grade of a child to make him understand. I was born and raised in Nicaragua. Lived in Costa Rica for 3 years and came back to start high school in Nicaragua, once I started high school I became as involved in I'm very interested in sustainability and environmental science. Partha Sarathi Reddy K. I have graduated with major in Electrical and Electronics Engineering.

Ever since I took math class at elementary school, I loved learning math. I was so curious in I am always ready to help students who need my help as it gives a sense of immense satisfaction. This cost can be attributed to the costs of manufacturing the dolls.

Now divide the manufacturing cost by the cost to manufacture a single doll: Every rectangle has a perimeter which can be represented by this equation: Every rectangle's area can be represented by this area formula: Using the equation for the perimeter, we can express one dimension in terms of the other. Let's express L as a function of W: Now we plug L in terms of W into the formula for the area: Now we rearrange the terms of the last equation to get this: Now we complete the trinomial square on the right side of the equation.

But first we must factor out -1 from each of the terms on that side: Now we put the equation in what is called the vertex form for the equation of a parabola. This step is critical, because it tells us the maximum value for the function. This particular function has a maximum at the vertex, because the sign in front of the expression on the right side is negative, i.

At that x value, which is W in our equation, the functional value is at a maximum. This means that the rectangle is a square. Related Questions Pre-calc homework help? Pre calc homework help?

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Online precalculus video lessons to help students with the notation, theory, and problems to improve their math problem solving skills so they can find the solution to their Precalculus homework and worksheets. Click your Precalculus textbook below for homework help. Our answers explain actual Precalculus textbook homework problems. Each answer shows how to solve a textbook problem, one step at a time.