Q. A parabola opening up or down has vertex (0,3) and passes through (−8,7). Write its equation in vertex form.Simplify any fractions.______
Vertex Form of Parabola: What is the vertex form of the parabola?The vertex form of a parabola is given by the equation y=a(x−h)2+k, where (h,k) is the vertex of the parabola.
Equation with Vertex: What is the equation of a parabola with a vertex at (0,3)?Substitute 0 for h and 3 for k in the vertex form.y=a(x−0)2+3y=ax2+3
Find 'a' Using Point: Use the point (−8,7) to find the value of 'a'.Replace the variables with (−8,7) in the equation.Substitute −8 for x and 7 for y.7=a(−8)2+37=64a+3
Solve for 'a': Solve for 'a'.7=64a+3Subtract 3 from both sides.4=64aDivide both sides by 64.644=aSimplify the fraction.161=a
Write Equation with 'a': Write the equation of the parabola with the value of 'a'.Substitute 161 for a in the equation y=ax2+3.y=(161)x2+3Vertex form of the parabola: y=(161)x2+3
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