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Factor as the product of two binomials.

x^(2)+11 x+18=

Factor as the product of two binomials.\newlinex2+11x+18= x^{2}+11 x+18=

Full solution

Q. Factor as the product of two binomials.\newlinex2+11x+18= x^{2}+11 x+18=
  1. Given Quadratic Expression: We are given the quadratic expression x2+11x+18x^2 + 11x + 18 and need to factor it into the product of two binomials. The general form of a quadratic expression is ax2+bx+cax^2 + bx + c, where aa, bb, and cc are constants. In this case, a=1a = 1, b=11b = 11, and c=18c = 18. We are looking for two numbers that multiply to acac (which is 1818) and add up to bb (which is ax2+bx+cax^2 + bx + c11).
  2. Finding the Factors: Let's list the pairs of factors of 1818 (since ac=18ac = 18): (1,18)(1, 18), (2,9)(2, 9), (3,6)(3, 6). We need to find a pair that adds up to 1111 (since b=11b = 11).
  3. Identifying the Numbers: Checking the pairs, we see that 22 and 99 add up to 1111. Therefore, the two numbers we are looking for are 22 and 99.
  4. Writing as Product of Binomials: Now we can write the original quadratic expression as the product of two binomials using the numbers 22 and 99: (x+2)(x+9)(x + 2)(x + 9).
  5. 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:\newlineFirst: x×x=x2x \times x = x^2\newlineOuter: x×9=9xx \times 9 = 9x\newlineInner: 2×x=2x2 \times x = 2x\newlineLast: 2×9=182 \times 9 = 18\newlineAdding these together, we get x2+9x+2x+18x^2 + 9x + 2x + 18, which simplifies to x2+11x+18x^2 + 11x + 18.