Given that the area of the rectangle is 2x^2 + 9x - 5 , determine the length of the rectangle.
6 answers
not enough information.
Sorry the width is x+5, I think I combine the like terms, is that right?
no
Area = length x width
so
2x^2 + 9x - 5 = (x+5)(.......)
you can do either a division, or just use common sense
where does the 2x^2 come from?
Wouldn't it be the multiplication of the first terms in the binomials?
where does the - 5 come from?
wouldn't it be the multiplication of the last numbers of the 2 binomials?
Area = length x width
so
2x^2 + 9x - 5 = (x+5)(.......)
you can do either a division, or just use common sense
where does the 2x^2 come from?
Wouldn't it be the multiplication of the first terms in the binomials?
where does the - 5 come from?
wouldn't it be the multiplication of the last numbers of the 2 binomials?
x^2-1
would it be this?
would it be this?
no.
what multiplied by (x+5) gives (2x^2+9x+5)?
Think. What multiplied by x gives 2x^2?
then what multliplied by 5 gives 5?
(??? +???)
what multiplied by (x+5) gives (2x^2+9x+5)?
Think. What multiplied by x gives 2x^2?
then what multliplied by 5 gives 5?
(??? +???)
2x-1