Question

Given f(x)=5/2x+7,if f(x)=-13 find x pls show work

Answer 1

Answer:

The value of x = -1/8

Step-by-step explanation:

Given

$f\left(x\right)=\frac{5}{2x}+7$

$f(x)=-13$

To determine

The value of x = ?

Using the function

$f\left(x\right)=\frac{5}{2x}+7$

substituting f(x) = -13 in the function

$-13=\frac{5}{2x}+7$

Subtract 7 from both sides

$-13-7=\frac{5}{2x}+7-7$

Simplify

$-20=\frac{5}{2x}$

Multiply both sides by 2x

$-20\cdot \:2x=\frac{5}{2x}\cdot \:2x$

Simplify

$-40x=5$

Divide both sides by -40

$\frac{-40x}{-40}=\frac{5}{-40}$

$x=-\frac{1}{8}$

Therefore, the value of x = -1/8

Answer 2

Answer:

x=-25.5

Step-by-step explanation:

5/2(-13) +7=-25.5