Identify Coefficients: Identify the coefficients of the quadratic trinomial.The quadratic trinomial is 2x2+9x+4. Here, the coefficient of x2 (a) is 2, the coefficient of x (b) is 9, and the constant term (c) is 4.
Find Multiplying Numbers: Find two numbers that multiply to ac (2×4=8) and add up to b (9).We need to find two numbers that multiply to 8 and add up to 9. The numbers that satisfy these conditions are 8 and 1 because 8×1=8 and 8+1=9.
Rewrite Middle Term: Rewrite the middle term using the two numbers found in Step 2.We can express 9x as 8x+x. So, the trinomial 2x2+9x+4 can be rewritten as 2x2+8x+x+4.
Factor by Grouping: Factor by grouping.Now we group the terms: 2x2+8x + x+4. We can factor out a common factor of 2x from the first group and a common factor of 1 from the second group, which gives us 2x(x+4)+1(x+4).
Factor out Common Factor: Factor out the common binomial factor.Since both groups contain the common binomial factor (x+4), we can factor it out to get (x+4)(2x+1).