Question

How do you foil `(–9x + 5)(–10x – 6)`?

Answer 1

`=color(blue)(90x^2+4x-30`

Explanation:

The expression is :`(-9x+5)(-10x-6)`

F O I L involves carrying out the below operations in the following order:

1) product of First terms :`(color(blue)(-9x and -10x))`+

2)product of Outside terms:`(color(blue)(-9x and -6))`+

3)product of Inside terms:`(color(blue)(5 and -10x))`+

4)product of Last terms:`(color(blue)(5 and -6))`

1) `-9x *-10x=color(blue)(90x^2) +`

2) `-9x * -6=color(blue)(54x)+`

3) `5* -10x = color(blue)(-50x)+`

4) `5*-6 = color(blue)(-30`

adding all the terms

`=color(blue)(90x^2+54x-50x-30`
`=color(blue)(90x^2+4x-30`