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Write the equation of the parabola that passes through the points (1,0)(1,0), (2,0)(2,0), and (3,16)(3,\text{–}16). Write your answer in the form y=a(xp)(xq)y = a(x – p)(x – q), where aa, pp, and qq are integers, decimals, or simplified fractions.\newline______

Full solution

Q. Write the equation of the parabola that passes through the points (1,0)(1,0), (2,0)(2,0), and (3,16)(3,\text{–}16). Write your answer in the form y=a(xp)(xq)y = a(x – p)(x – q), where aa, pp, and qq are integers, decimals, or simplified fractions.\newline______
  1. Identify x-intercepts: We are given three points through which the parabola passes: (1,0)(1,0), (2,0)(2,0), and (3,16)(3,–16). The points (1,0)(1,0) and (2,0)(2,0) are the x-intercepts of the parabola, which means they correspond to the values of pp and qq in the equation y=a(xp)(xq)y = a(x – p)(x – q). Therefore, we can immediately identify p=1p = 1 and q=2q = 2.
  2. Write parabola equation: Now that we have pp and qq, we can write the equation of the parabola as y=a(x1)(x2)y = a(x – 1)(x – 2). However, we still need to find the value of the coefficient aa. To do this, we will use the third point (3,16)(3, –16) by substituting xx with 33 and yy with 16–16 in the equation and solving for aa.
  3. Substitute third point: Substituting the point (3,16)(3, -16) into the equation gives us 16=a(31)(32)-16 = a(3 - 1)(3 - 2). Simplifying the right side of the equation, we get 16=a(2)(1)-16 = a(2)(1), which simplifies further to 16=2a-16 = 2a. Dividing both sides by 22, we find that a=16/2=8a = -16 / 2 = -8.
  4. Solve for coefficient aa: Having found a=8a = -8, we can now write the complete equation of the parabola. Substituting aa, pp, and qq into y=a(xp)(xq)y = a(x - p)(x - q) gives us the final equation y=8(x1)(x2)y = -8(x - 1)(x - 2).

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