Question

Find the value of x such that f(x)=90 is true f(x)=5(x+11)

Answer 1

Answer:

Here you go, i didnt want to write it out.

Step-by-step explanation:

Answer 2

You can equate both equations' right side as left side is already f(x) and we have to find the value of x.

The value of x at which f(x) is 90 is given by

x = 7

How to find the value of x for which the given function outputs 90 as value?

Since we have two equations:

$f(x) = 90\\f(x) = 5(x+1)$

and both's left side are same thus, we have:

$f(x) = 90 = 5(x + 11)$

Taking the later two equality, we get:

$90 = 5(x + 11)\\\\\text{Dividing both sides with 5}\\\\\dfrac{90}{5} = \dfrac{5(x+11)}{5} \\\\18 = x + 11\\\\\text{Subtracting 11 from both the sides}\\\\18 - 11 = x + 11 - 11\\\\7 = x\\x = 7$

Thus,

The value of x at which f(x) is 90 is given by

x = 7

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