Q. Factor as the product of two binomials.x2+11x+18=
Given Quadratic Expression: We are given the quadratic expression x2+11x+18 and need to factor it into the product of two binomials. The general form of a quadratic expression is ax2+bx+c, where a, b, and c are constants. In this case, a=1, b=11, and c=18. We are looking for two numbers that multiply to ac (which is 18) and add up to b (which is ax2+bx+c1).
Finding the Factors: Let's list the pairs of factors of 18 (since ac=18): (1,18), (2,9), (3,6). We need to find a pair that adds up to 11 (since b=11).
Identifying the Numbers: Checking the pairs, we see that 2 and 9 add up to 11. Therefore, the two numbers we are looking for are 2 and 9.
Writing as Product of Binomials: Now we can write the original quadratic expression as the product of two binomials using the numbers 2 and 9: (x+2)(x+9).
Verifying the Factoring: To verify that we have factored correctly, we can use the FOIL method (First, Outer, Inner, Last) to expand the binomials and check if we get the original expression:First: x×x=x2Outer: x×9=9xInner: 2×x=2xLast: 2×9=18Adding these together, we get x2+9x+2x+18, which simplifies to x2+11x+18.