Type Product: (x + a) * (x + b)

Notable products are binomial multiplications that respect a standard form of resolution. The square of the sum of two terms (a + b) ², the square of the difference of two terms (a – b) ², the cube of the sum of two terms (a + b) ³ and the cube of the difference of two terms (a – b) ³ are the main notable products within the Math. Another product involving multiplications of the type (x + a) * (x + b) is also known, as it generates trinomials considered not perfect.
Perfect trinomials are connected to the square of the sum of two terms and the square of the difference of two terms. Take a look at some examples:

x² + 6x + 9 = (x + 3)² = (x + 3) *(x + 3)

x² + 16x + 64 = (x + 8)² = (x + 8) * (x + 8)

x² – 24x + 144 = (x – 12)² = (x – 12) * (x – 12)

x² – 20x + 100 = (x – 10)² = (x – 10) * (x – 10)


The non-perfect trinomials are linked to the multiplications (x + a) * (x + b) and are also called trinomials: sum and product. Watch:

Apply distribution

(x + a) * (x + b) → x² + b*x + a*x + a*b → x² + x * (b + a) +a*b

The trinomial result of multiplication (x + a) * (x + b) can be written in the form
x² + Sx + P, where S is the sum of a + b and P the product of a and b.

(x + 3) * (x + 6) = x² + (3 + 6)x + 6 * 3 = x² + 9x + 18

(x – 4) * (x + 8) = x² + (–4 + 8)x + (–4) * 8 = x² + 4x – 32

(x – 12) * (x – 5) = x² + (–12 –5)x + (–12) * (–5) = x² - 17x + 60

(x + 7) * (x – 9) = x² + (7 – 9)x + (– 9) * 7 = x² -2x - 63

by Mark Noah
Graduated in Mathematics

Source: Brazil School - https://brasilescola.uol.com.br/matematica/produto-tipo-x--x-b.htm

Land reform. Objectives and challenges of Agrarian Reform.

Land reform. Objectives and challenges of Agrarian Reform.

Land reform it is basically the fairest redistribution of land.Land concentration in Brazil is th...

read more
Complementary, supplementary and adjacent angles

Complementary, supplementary and adjacent angles

We can say that a angle is the region of the plane limited by two semi-straight of the same origi...

read more
Separation of mixtures with a bromine funnel

Separation of mixtures with a bromine funnel

The term mixtures refers to the union of two or more different substances. In nature and especial...

read more