(y+1)(y-3)
How do I multip;y these? (y+1)(y-3)
Use a process called cross multiplication.
First, multiply the two terms at the left side of
each parenthesss, the two y terms.
y * y
Then, multiply the right term in the left parentheses
by the left term in the right parentheses.
1 * y
Now, multiply the left term in the left parentheses
by the right term in the right parenteses.
y * -3
Last, multiply the two terms at the right
side of each parentheses, the two constants.
1 * -3
You have y * y + 1 * y + y * -3 + 1 * -3
Finish any multiplication, addition or subtraction.
y^2 + y - 3y - 3
y^2 -2y -3