-3x+15=0
Add -15 both sides
-3x=-15
Divided by -3 both sides
x=-15/-3
x=5
Answer:
10 feet
Step-by-step explanation:
base= x feet
height=(6+x) feet
area= (6+x)x=160
=6x+x²=160 ==> x²+6x-160=0
factories the eqn obtained....
(x-10)(x+16)=0
x= 10 or -16
since length cannot be negative, x=10
since the base = x feet
base=10 feet
Set each equation equal to zero.
y + 5 = 0
Subtract 5 from both sides.
y = 0 - 5
y = - 5
y - 9 = 0
Add 9 to both sides
y = 0 + 9
y = 9
y = - 5, 9
