Recognize the structure: Recognize the structure of the quadratic expression.The given expression is in the form of a quadratic trinomial ax2+bx+c.We need to factor it into the form (dx−e)(fx−g), where d, e, f, and g are numbers to be determined.
Identify the coefficients: Identify the coefficients of the quadratic expression.The coefficients are a=9, b=−12, and c=4.We need to find two numbers that multiply to ac (9×4=36) and add up to b (−12).
Find two numbers: Find two numbers that multiply to 36 and add up to −12.The numbers −6 and −6 multiply to 36 and add up to −12.
Rewrite the middle term: Rewrite the middle term using the numbers found in Step 3.The expression 4−12x+9x2 can be rewritten as 9x2−6x−6x+4.
Factor by grouping: Factor by grouping.Group the terms to factor by grouping: (9x2−6x)+(−6x+4).Factor out the common factors from each group: 3x(3x−2)−2(3x−2).
Factor out the common binomial factor: Factor out the common binomial factor.The common binomial factor is (3x−2).The factored form is (3x−2)(3x−2) or (3x−2)2.
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