Algebra 1
posted by Janae .
1. m^2  7m  30
2. z^2 + 65z + 1000
3.x^2  45x + 450
4.d^2  33 d  280

The area of a rectangular field is given by the trinomial t2 – 4t – 45. The length of the rectangle is t + 5. What is the expression for the width of the field?

MathMate already did one of them for you
http://www.jiskha.com/display.cgi?id=1329964907
why not try his method for the others.
I will do the last one: d^2  33d  280
280 = 56x5 , difference in factors of 33 ? no
280 = 40x7 , difference in factors of 33 ? YES
280 = 40 x 7 , (40) + 7 = 33
so
d^2  33d  280 = (d  40)(d + 7)
ok, your turn
Show us how you would do the other two. 
Please do not insert a new question as a reply to somebody else's question.
All you have to do is factor t^2  4t 45
To make it really simple, one of the factors is already given, so
t^2  4t  45 = (t+5)(........)
you know it has to start with (t ......) and end in (.....9)
so (t+5)(t9)
does that produce a middle term of 4t ?? , YES
so we are done.
the width is t9 
1000=2x500
1000=4x250
1000=5x200 don't none of them work