Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

The power generated by an electrical circuit (in watts) as a function of its current 
x (in amperes) is modeled by

P(x)=-15 x(x-8)
What current will produce the maximum power?
amperes

The power generated by an electrical circuit (in watts) as a function of its current xx (in amperes) is modeled by\newlineP(x)=15x(x8)P(x)=-15x(x-8)\newlineWhat current will produce the maximum power?\newlineamperes

Full solution

Q. The power generated by an electrical circuit (in watts) as a function of its current xx (in amperes) is modeled by\newlineP(x)=15x(x8)P(x)=-15x(x-8)\newlineWhat current will produce the maximum power?\newlineamperes
  1. Rewrite Quadratic Function: To find the current that will produce the maximum power, we need to find the vertex of the parabola represented by the quadratic function P(x)=15x(x8)P(x) = -15x(x - 8). \newlineFirst, we need to rewrite the function in standard form.\newlineP(x)=15x2+120xP(x) = -15x^2 + 120x\newlineThe quadratic function is in the form P(x)=ax2+bx+cP(x) = ax^2 + bx + c. \newlineHere, a=15a = -15 and b=120b = 120.
  2. Find Parabola Vertex: P(x)=15x2+120xP(x) = -15x^2 + 120x\newlineSince the coefficient of x2x^2 is negative (15-15), the parabola opens downwards, and the vertex will give us the maximum point.
  3. Calculate x-coordinate: To find the xx-coordinate of the vertex, we use the formula b2a-\frac{b}{2a}. \newlineNow we apply the formula to find the x-coordinate of the vertex: \newlinex=b2a=1202×15=12030=4x = -\frac{b}{2a} = -\frac{120}{2 \times -15} = -\frac{120}{-30} = 4
  4. Verify Calculations: The xx-coordinate of the vertex is 44 amperes. This is the current that will produce the maximum power in the electrical circuit.\newlineTo ensure there are no math errors, we can check our calculations:\newline15×4×(48)=15×4×4=240-15 \times 4 \times (4 - 8) = -15 \times 4 \times -4 = 240\newlineThis is a positive value, and since the parabola opens downwards, it confirms that the vertex is indeed a maximum point.

More problems from Find the roots of factored polynomials