We have [tex](2x-5)(2x+10)[/tex]
We multiply [tex]2x [/tex] by the terms in the second parenthesis.
Next we multiply [tex]-5[/tex] by the terms in the second parenthesis.
You should get [tex]4x^2+20x-10x-50[/tex]
Next, combine like terms, and you will get
[tex]4x^2+10x-50[/tex]
