Question 160319
L=W+3
HERE YOU HAVE A RIGHT TRIANGLE OF SIDES L & W WITH AN HYPOTENUSE=15
THUS USING THE PYTHAGOREAN THEOREM (A^2+B^2=C^2)WE GET:
(W+3)^2+W^2=15^2
W^2+6W+9+W^2=225
2W^2+6W+9-225=0
2W^2+6W-216=0
2(W^2+3W-108)=0
2(W-9)(W+12)=0
W-9=0
W=9 FOR THE WIDTH
L=9+3=12 FOR THE LENGTH.
PROOF:
9^2+12^2=15^2
81+144=225
225=225