Question

Find x such that f(x) = 10 given f(x) = 4x+2​

Answer 1

Required AnswèR :

$\boxed {\blue{\boxed {\sf x=2}}}$

★Explanation:

As we know that:

$\sf {f(x)=4x+2} \\ \sf {f(x)= 10}$

•Both 4x+2 and 10 are equal to f(x). We can use substitution and set 4x+2 and 10 equal to each other.

$\longmapsto\sf {4x+2=10}$

→Now, solve for x. Perform the inverse operations to isolate x on one side of the equation.

2 is being added to 4x. The inverse of addition is subtraction. Subtract 2 from both sides of the equation.

$\leadsto\sf{4x+2-2=10-2}$

$\leadsto\sf{4x=10-2}$

$\leadsto\sf{4x=8}$

• x is being multiplied by 4. The inverse of multiplication is division. Divide both sides of the equation by 4.

$\leadsto\sf\dfrac{4x}{4} =\dfrac{8}{4}$

$\leadsto\sf{x=}\dfrac{8}{4}$

$\leadsto\sf {x=2}$

For the function f(x)= 4x+2, when f(x)=20, x=2

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Answer 2

Answer:

f(x) = 4x+2

10 = 4x+2 [f(x) = 10]

4x+2 = 10

4x = 10-2

4x = 8

x = 8/4

x = 2