Explanation:
180 =16x-100-0.1x2
-0.1x2+16x-280=0
x2-160x+2800=0
S=160
P=2800
DELTA=160*160-4*2800
DELTA=25600-10800
DELTA=14400
x1,2=160+/-
divided by 2
x1,2=160+/-120 div by 2
x1=140
x2=20
1.6m questions
2.0m answers