How do you write the quadratic function in standard form y=4(x-1)^2+5y=4(x1)2+5?

2 Answers
Jun 25, 2017

y=4x^2-8x+6y=4x28x+6

Explanation:

y=4(x-1)^2+5y=4(x1)2+5 This is Vertex form.

Expand & simplify
y=4\cdot(x-1)(x-1)+5y=4(x1)(x1)+5
y=4\cdot(x^2-2x+1)+5y=4(x22x+1)+5
y=4x^2-8x+4+5y=4x28x+4+5
y=4x^2-8x+9y=4x28x+9 This is Standard form.

Jun 25, 2017

y=4x^2-8x+9y=4x28x+9

Explanation:

"the equation of a parabola in "color(blue)"standard form"the equation of a parabola in standard form is.

color(red)(bar(ul(|color(white)(2/2)color(black)(y=ax^2+bx+c ; a!=0)color(white)(2/2)|)))

"expand " (x-1)^2" using FOIL"

y=4(x^2-2x+1)+5

color(white)(y)=4x^2-8x+4+5

color(white)(y)=4x^2-8x+9larrcolor(red)" in standard form"