L=W+10
area= LW=375
375=W(W+10)
w^2+10W-375=0
completing the square
W^2+10w+25=400
(w+5)=20
w=15,L=25
A homeowner wants to plant a garden in his backyard. He decides to have 375 square feet garden and wants the garden to be 10 feet longer than it is wide. Find the dimensions of the garden.
2 answers
width --- x ft
length -- x+10 ft
solve
x(x+10) = 375
x^2 + 10x - 375 = 0
(x+25)(x-15) = 0
x = 15 or x = a negative
width: 15 ft
length : 25 ft
check: 15x25 = 375
length -- x+10 ft
solve
x(x+10) = 375
x^2 + 10x - 375 = 0
(x+25)(x-15) = 0
x = 15 or x = a negative
width: 15 ft
length : 25 ft
check: 15x25 = 375
2 answers