The parabola shown is defined by the equation y=31x2−2x−4. If the line defined by the equation y=−38(x+5)+9 is also graphed, at what point (x,y) will the line and parabola intersect?
Q. The parabola shown is defined by the equation y=31x2−2x−4. If the line defined by the equation y=−38(x+5)+9 is also graphed, at what point (x,y) will the line and parabola intersect?
Set Equations Equal: To find the intersection point(s) of the line and the parabola, we need to set their equations equal to each other and solve for x. y=31x2−2x−4 (Parabola) y=−38(x+5)+9 (Line) 31x2−2x−4=−38(x+5)+9
Simplify and Solve: Now we will simplify and solve the equation for x. 31x2−2x−4=−38x−38⋅5+9 31x2−2x−4=−38x−340+9 To clear the fractions, multiply every term by 3: x2−6x−12=−8x−40+27
Combine Like Terms: Combine like terms and move all terms to one side to form a quadratic equation:x2−6x−12+8x+13=0x2+2x+1=0
Factor Quadratic Equation: The quadratic equation x2+2x+1 can be factored as (x+1)2=0.
Solve for x: Solve for x by taking the square root of both sides:x+1=0x=−1
Substitute x and Solve for y: Now that we have the x-coordinate of the intersection point, we need to substitute x back into either the original line or parabola equation to find the corresponding y-coordinate.Let's substitute x into the line's equation:y=−(38)(−1+5)+9
Calculate y-coordinate: Calculate the y-coordinate:y=−38(4)+9y=−332+9y=−332+327y=−35
Find Intersection Point: The intersection point (x,y) is (−1,−35), which corresponds to answer choice (D).