1. **State the problem:** We have two functions:
$$f(x) = x^2 + 3x - 5$$
$$g(x) = 2x - 3$$
We need to find:
a) $f(-1)$
b) $f(0)$
c) $g\left(\frac{1}{2}\right)$
d) $f(2b)$
e) $g(1 - 4a)$
f) $x$ when $f(x) = g(x)$
2. **Recall the formulas:**
- To find $f(c)$, substitute $x=c$ into $f(x)$.
- To find $g(c)$, substitute $x=c$ into $g(x)$.
- To solve $f(x) = g(x)$, set the expressions equal and solve for $x$.
3. **Calculate each part:**
**a) Calculate $f(-1)$:**
$$f(-1) = (-1)^2 + 3(-1) - 5 = 1 - 3 - 5 = -7$$
**b) Calculate $f(0)$:**
$$f(0) = 0^2 + 3(0) - 5 = 0 + 0 - 5 = -5$$
**c) Calculate $g\left(\frac{1}{2}\right)$:**
$$g\left(\frac{1}{2}\right) = 2\left(\frac{1}{2}\right) - 3 = 1 - 3 = -2$$
**d) Calculate $f(2b)$:**
$$f(2b) = (2b)^2 + 3(2b) - 5 = 4b^2 + 6b - 5$$
**e) Calculate $g(1 - 4a)$:**
$$g(1 - 4a) = 2(1 - 4a) - 3 = 2 - 8a - 3 = -8a - 1$$
**f) Solve $f(x) = g(x)$:**
Set equal:
$$x^2 + 3x - 5 = 2x - 3$$
Bring all terms to one side:
$$x^2 + 3x - 5 - 2x + 3 = 0$$
Simplify:
$$x^2 + x - 2 = 0$$
Factor:
$$(x + 2)(x - 1) = 0$$
Solutions:
$$x = -2 \quad \text{or} \quad x = 1$$
**Final answers:**
- a) $f(-1) = -7$
- b) $f(0) = -5$
- c) $g\left(\frac{1}{2}\right) = -2$
- d) $f(2b) = 4b^2 + 6b - 5$
- e) $g(1 - 4a) = -8a - 1$
- f) $x = -2$ or $x = 1$
Function Evaluation 401E98
Step-by-step solutions with LaTeX - clean, fast, and student-friendly.