CPM Homework Help : INT2 Problem 5-102

Write an equation for each representation of a quadratic function given below.

Hint (a):
Use the $x$ -intercepts to help you write the equation.
Answer (a):
$y = (x + 3)(x - 1) = x^2 + 2x - 3$

$x$

x column 1 $–4$

x column 2 $–3$

x column 3 $–2$

x column 4 $–1$

x column 5 $0$

x column 6 $1$

x column 7 $2$

x column 8 $3$

x column 9 $4$

$y$

y column 1 $12$

y column 2 $5$

y column 3 $0$

y column 4 $–3$

y column 5 $–4$

y column 6 $–3$

y column 7 $0$

y column 8 $5$

y column 9 $12$

Hint (b):

The $x$ -intercepts are the points where $y = 0$ .

Which function has the largest maximum value?
Answer (c):
Neither, they both increase indefinitely.