y=−(x−5)2+9The given equation represents a parabola in the xy-plane. Which of the following equivalent forms of the equation displays the x-intercepts of the parabola as constants or coefficients?Choose 1 answer:(A) y=−x2+10x−16(B) y=−(x−8)(x−2)(C) y=−(x−7)(x−3)+5(D) y=−x(x−10)−16
Q. y=−(x−5)2+9The given equation represents a parabola in the xy-plane. Which of the following equivalent forms of the equation displays the x-intercepts of the parabola as constants or coefficients?Choose 1 answer:(A) y=−x2+10x−16(B) y=−(x−8)(x−2)(C) y=−(x−7)(x−3)+5(D) y=−x(x−10)−16
Set y to 0: The given equation is y=−(x−5)2+9. To find the x-intercepts, we need to set y to 0 and solve for x.0=−(x−5)2+9
Add squared term: Add (x−5)2 to both sides to isolate the squared term.(x−5)2=9
Take square root: Take the square root of both sides to solve for x. Remember that taking the square root of both sides introduces a plus or minus sign.x−5=±9
Solve for x: Since 9 is 3, we have:x−5=±3
Find solutions for x: Solve for x by adding 5 to both sides of each equation.x=5±3
Determine factored form: This gives us two solutions for x, which are the x-intercepts of the parabola.x=8 and x=2
Identify correct form: Now we need to find the equivalent form of the equation that displays these x-intercepts as constants or coefficients. The factored form of a quadratic equationy=a(x−r)(x−s) directly shows the x-intercepts r and s. So we need to find the factored form that has (x−8) and (x−2) as factors.
Identify correct form: Now we need to find the equivalent form of the equation that displays these x-intercepts as constants or coefficients. The factored form of a quadratic equation y=a(x−r)(x−s) directly shows the x-intercepts r and s. So we need to find the factored form that has (x−8) and (x−2) as factors.The correct factored form that represents the x-intercepts 8 and 2 is:y=a(x−r)(x−s)0
Identify correct form: Now we need to find the equivalent form of the equation that displays these x-intercepts as constants or coefficients. The factored form of a quadratic equation y=a(x−r)(x−s) directly shows the x-intercepts r and s. So we need to find the factored form that has (x−8) and (x−2) as factors.The correct factored form that represents the x-intercepts 8 and 2 is:y=a(x−r)(x−s)0Comparing this with the answer choices, we see that option (B) matches our factored form.
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