Identify Quadratic Trinomial: Identify the quadratic trinomial and its coefficients.The given quadratic trinomial is 3x2+33x+90, where the coefficients are a=3, b=33, and c=90.
Find Multiplying Numbers: Look for two numbers that multiply to ac (a×c) and add up to b. We need to find two numbers that multiply to 3×90=270 and add up to 33.
Determine Two Numbers: Find the two numbers.The two numbers that multiply to 270 and add up to 33 are 15 and 18.Check: 15×18=270 and 15+18=33.
Rewrite Middle Term: Rewrite the middle term using the two numbers found in Step 3.Rewrite 33x as 15x+18x, so the expression becomes 3x2+15x+18x+90.
Factor by Grouping: Factor by grouping. Group the terms into two pairs: 3x2+15x and 18x+90. Factor out the greatest common factor from each pair. The greatest common factor of the first pair is 3x, and the second pair is 18. The expression becomes 3x(x+5)+18(x+5).
Factor Out Common Factor: Factor out the common binomial factor.The common binomial factor is (x+5).Factor out (x+5) from the expression to get (x+5)(3x+18).
Simplify Second Factor: Simplify the second factor if possible.The second factor 3x+18 can be simplified by factoring out a 3.The expression becomes (x+5)(3(x+6)).
Write Final Factored Form: Write the final factored form.The final factored form of the expression 3x2+33x+90 is (x+5)(3x+18).