Identify a, b, c: Identify a, b, and c in the trinomial 2x2+11x+12. Compare 2x2+11x+12 with ax2+bx+c. a=2b0b1
Find product and sum: Find two numbers whose product is a∗c (2∗12=24) and whose sum is b (11).We need to find two numbers that multiply to 24 and add up to 11.The numbers 8 and 3 satisfy these conditions because:8∗3=248+3=11
Rewrite middle term: Rewrite the middle term 11x using the two numbers found in Step 2.Express 11x as 8x+3x.The trinomial becomes 2x2+8x+3x+12.
Factor by grouping: Factor by grouping.Group the terms as follows: (2x2+8x)+(3x+12).Factor out the common factors from each group.From 2x2+8x, factor out 2x to get 2x(x+4).From 3x+12, factor out 3 to get 3(x+4).Now we have 2x(x+4)+3(x+4).
Factor out common binomial: Factor out the common binomial factor (x+4).The factored form is (x+4)(2x+3).