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If [tex]f(x) = 16x - 30[/tex] and [tex]g(x) = 14x - 6[/tex], for which value of [tex]x[/tex] does [tex](f-g)(x) = 0[/tex]?

A. [tex]-18[/tex]
B. [tex]-12[/tex]
C. [tex]12[/tex]
D. [tex]18[/tex]


Sagot :

To determine the value of [tex]\(x\)[/tex] for which [tex]\((f - g)(x) = 0\)[/tex], we first need to express [tex]\((f - g)(x)\)[/tex] in terms of [tex]\(f(x)\)[/tex] and [tex]\(g(x)\)[/tex].

We are given the functions:
[tex]\[ f(x) = 16x - 30 \][/tex]
[tex]\[ g(x) = 14x - 6 \][/tex]

We need to find the value of [tex]\(x\)[/tex] for which:
[tex]\[ (f - g)(x) = 0 \][/tex]

First, let's evaluate [tex]\((f - g)(x)\)[/tex]:
[tex]\[ (f - g)(x) = f(x) - g(x) \][/tex]
Substitute the expressions for [tex]\(f(x)\)[/tex] and [tex]\(g(x)\)[/tex]:
[tex]\[ (f - g)(x) = (16x - 30) - (14x - 6) \][/tex]

Next, simplify the expression inside the parentheses:
[tex]\[ (f - g)(x) = 16x - 30 - 14x + 6 \][/tex]

Combine like terms:
[tex]\[ (f - g)(x) = (16x - 14x) + (-30 + 6) \][/tex]
[tex]\[ (f - g)(x) = 2x - 24 \][/tex]

For [tex]\((f - g)(x) = 0\)[/tex], set the simplified expression equal to zero:
[tex]\[ 2x - 24 = 0 \][/tex]

Solve for [tex]\(x\)[/tex]:
[tex]\[ 2x = 24 \][/tex]
[tex]\[ x = 12 \][/tex]

Therefore, the value of [tex]\(x\)[/tex] for which [tex]\((f - g)(x) = 0\)[/tex] is [tex]\( \boxed{12} \)[/tex].