Q. Rewrite the expression as a product of four linear factors:(3x2−x)2−6(3x2−x)+8Answer:
Recognize Quadratic Form: Recognize the given expression as a quadratic in form The expression (3x2−x)2−6(3x2−x)+8 resembles a quadratic equation in the form of (ax)2−bx+c, where 'ax' is (3x2−x). To factor it, we can treat (3x2−x) as a single variable, say 'y'. So, let y=(3x2−x). The expression then becomes y2−6y+8.
Factor Quadratic Expression: Factor the quadratic expressionNow we factor y2−6y+8. This factors into (y−2)(y−4), because (y−2)(y−4)=y2−4y−2y+8=y2−6y+8.
Substitute and Expand: Substitute back (3x2−x) for y We now replace y with (3x2−x) in the factors we found. So, (y−2)(y−4) becomes ((3x2−x)−2)((3x2−x)−4).
Find Linear Factors: Expand the factors to find the linear factorsWe need to expand ((3x2−x)−2) and ((3x2−x)−4) to find the linear factors. First, we simplify the expressions:(3x2−x−2)=(3x2−3x+2x−2)=3x(x−1)+2(x−1)=(3x+2)(x−1)(3x2−x−4)=(3x2−3x+2x−4)=3x(x−1)+2(x−2)=(3x+2)(x−2)
Write Product of Factors: Write the product of four linear factorsThe product of the four linear factors is then (3x+2)(x−1)(3x+2)(x−2). However, we notice that (3x+2) is repeated, so we can write the factors as (3x+2)2(x−1)(x−2).