Yay, love these ones.
First of all, (4x-+3)(-2x-5) is the same as (4x-3)(-2x-5)
So the method for solving these can be remembered by FOIL.
F= Firsts O= Outsides I= Insides L= Lasts
In other words everything is multiplied by everything, for example:
4x * -2x and -3 * -5 is the firsts of the brackets multiplied and last of the brackets mulitplied
4x * -5 and 3 * -2x is the outsides of the brackets multiplied and the insides of the brackets multiplied
The SUM of FOIL is then added:
4x*-2x = -8x^2
-3*-5= 15
4x*-5=-20x
3*-2x=-6x
-8x^2 -20x -6x + 15 = 0
-8x^2 -26x + 15 = 0
So the factored of (4x-3)(-2x-5) = -8x^2 -26x + 15 = 0
So then you graph that equation on your given grid
