Question

For 4 & 5 evaluate the following functions at x = 3.
4. f = 5x + 3
5. g = 2x-1/x+2 ​

Answer 1

Answer:

4. ans is 18

5. ans is 1

Step-by-step explanation:

Q4.

f=5×3+3

f=15+3

f=18

Q5.

g=2×3-1/3+2

g=6-1/5

g=5/5

g=1

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Answer 2

Step-by-step explanation:

Given :

$4) \: f(x) = 5x + 3$

$5) \: g(x) = \frac{2x - 1}{x + 2}$

To find: Find values of both functions at x=3.

Solution:

Tip:Put 3 at the places of x.

$4) \: f(x) = 5x + 3$

Step 1: Put x=3 in f(x)

$f(3) = 5(3) + 3$

Step 2: Follow BODMAS and solve

$f(3) = 15 + 3$

$\bf \pink{f(3) = 18}$

$5) \: g(x) = \frac{2x - 1}{x + 2}$

Step 1: Put x=3

$g(3) = \frac{2(3) - 1}{3 + 2}$

Step 2: Solve

$g(3) = \frac{6 - 1}{5}$

or

$g(3) = \frac{5}{5}$

$\bf \green{g(3) = 1}$

Final answer:

$\bold{4)f(3) = 18}$

$\bold{5)g(3) = 1}$

Hope it helps you.

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