Answer:
- 4x² + 6xy - y²
Step-by-step explanation:
8x² + 3xy + 4y² - 12x² + 3xy - 5y² ← collect like terms
= (8x² - 12x² ) + (3xy + 3xy) + (4y² - 5y²)
= - 4x² + 6xy - y²
Disturb -4 into the parentheses
-24x-12=-12
add 12 both sides
-24x=0
divide-24 both sides
x=0
Answer:
<h2>-10x - 20y</h2>
Step-by-step explanation:
Let w and 2w-5 be the width and length, respectively, of the rectangle. Then:
w(2w-5)=52
2w²-5w-52=0
(2w-13)(w+4)=0
w=13/2 or -4
The rectangle is 6.5 ft by 8 ft. ☺☺☺☺