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8. Find the product of the following functions:

(a) [tex]f(x) = x + 3[/tex] and [tex]g(x) = x - 3[/tex]

Sagot :

To find the product of the functions [tex]\( f(x) = x + 3 \)[/tex] and [tex]\( g(x) = x - 3 \)[/tex], we need to multiply these two functions together.

Let's define the product of [tex]\( f(x) \)[/tex] and [tex]\( g(x) \)[/tex] as [tex]\( h(x) \)[/tex].

So, [tex]\( h(x) = f(x) \cdot g(x) \)[/tex].

Substitute the expressions for [tex]\( f(x) \)[/tex] and [tex]\( g(x) \)[/tex]:

[tex]\[ h(x) = (x + 3) \cdot (x - 3) \][/tex]

Using the difference of squares formula [tex]\( (a + b)(a - b) = a^2 - b^2 \)[/tex]:

[tex]\[ h(x) = x^2 - 3^2 \][/tex]

Simplify the expression:

[tex]\[ h(x) = x^2 - 9 \][/tex]

Now let's evaluate [tex]\( h(x) \)[/tex] at a specific value of [tex]\( x \)[/tex]. For instance, let’s choose [tex]\( x = 1 \)[/tex]:

[tex]\[ h(1) = 1^2 - 9 \][/tex]

Calculate the value:

[tex]\[ h(1) = 1 - 9 \][/tex]

[tex]\[ h(1) = -8 \][/tex]

Thus, the product of the functions [tex]\( f(x) = x + 3 \)[/tex] and [tex]\( g(x) = x - 3 \)[/tex] evaluated at [tex]\( x = 1 \)[/tex] is:

[tex]\[ h(1) = -8 \][/tex]