What is the standard form of y= (x-6)(x-4)(x-1)y=(x6)(x4)(x1)?

1 Answer
Jan 1, 2016

y=x^3-11x^2+34x-24y=x311x2+34x24

Explanation:

To rewrite the equation in standard form, start by expanding the first two brackets:

y=(color(red)xy=(x color(green)(-6))(color(orange)x6)(x color(blue)(-4))(x-1)4)(x1)

y=(color(red)x(color(orange)x)y=(x(x) color(red)(+x)(color(blue)(-4))+x(4) color(orange)(+x)(color(green)(-6))+x(6) color(green)(-6)(color(blue)(-4)))(x-1)6(4))(x1)

Simplify.

y=(x^2-4x-6x+24)(x-1)y=(x24x6x+24)(x1)

y=(x^2-10x+24)(x-1)y=(x210x+24)(x1)

Expand the remaining two brackets:

y=(color(red)(x^2)y=(x2 color(orange)(-10x)10x color(blue)(+24))(color(green)x+24)(x color(purple)(-1))1)

y=color(red)(x^2)(color(green)x)y=x2(x) color(red)(+x^2)(color(purple)(-1))+x2(1) color(orange)(-10x)(color(green)x)10x(x) color(orange)(-10x)(color(purple)(-1))10x(1) color(blue)(+24)(color(green)x)+24(x) color(blue)(+24)(color(purple)(-1))+24(1)

Simplify.

y=x^3-x^2-10x^2+10x+24x-24y=x3x210x2+10x+24x24

y=x^3-11x^2+34x-24y=x311x2+34x24