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What are the values of b and c in the trinomial x2 + 5x + 6, and what are the two integers r and s?

Mathematics

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here are the solutions to Activity 3:

3.1.1 What is the value of bb and cc in the trinomial?
Comparing x2+5x+6x^2 + 5x + 6 to the general form x2+bx+cx^2 + bx + c:
b=5b = \boxed{5}
c=6c = \boxed{6}

3.1.2 Use the table below to determine the two integers, rr and ss.

Factors of 6Product of the two factorsSum of the two factorsResult
1 and 61×6=61 \times 6 = 61+6=71 + 6 = 7product =6= 6 but sum ≠5\neq 5
−1-1 and −6-6(−1)×(−6)=6(-1) \times (-6) = 6(−1)+(−6)=−7(-1) + (-6) = -7product =6 but sum ≠5\boxed{\text{product } = 6 \text{ but sum } \neq 5}
2 and 32×3=6\boxed{2 \times 3 = 6}2+3=5\boxed{2 + 3 = 5}product =6 and sum =5\boxed{\text{product } = 6 \text{ and sum } = 5}
−2-2 and −3-3(−2)×(−3)=6(-2) \times (-3) = 6(−2)+(−3)=−5(-2) + (-3) = -5product =6 but sum ≠5\boxed{\text{product } = 6 \text{ but sum } \neq 5}

Which two integers will correctly provide the values of bb and cc in the expression x2+5x+6x^2 + 5x + 6?
The two integers are 2 and 3\boxed{2 \text{ and } 3}.

3.1.3 Rewrite x2+5x+6x^2 + 5x + 6 as an equivalent expression in the form x2+rx+sx+6x^2 + rx + sx + 6.
Using r=2r=2 and s=3s=3:

x2+2x+3x+6x^2 + 2x + 3x + 6

The equivalent expression is x2+2x+3x+6\boxed{x^2 + 2x + 3x + 6}.

3.1.4 Use the knowledge obtained from activity 2 on grouping and the distributive property to factorize the expression.

  1. Group the terms of the rewritten expression.

    (x2+2x)+(3x+6)(x^2 + 2x) + (3x + 6)
  2. Factor out the common factor from each group.

    x(x+2)+3(x+2)x(x + 2) + 3(x + 2)
  3. Factor out the common binomial factor (x+2)(x + 2).

    (x+2)(x+3)(x + 2)(x + 3)

    The factored expression is (x+2)(x+3)\boxed{(x + 2)(x + 3)}.

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