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Sagot :
Answer:
d)25cm,20cm
c)6,3
Step-by-step explanation:
d)P=2(l+b)
90=2(l+b)
l+b=90/2
l+b=45
A=l×b
500=lb
l=45-b
500=(45-b)b
500=45b-b²
b²-45b+500=0
b²-25b-20b+500=0
b(b-25)-20(b-25)=0
(b-20)(b-25)=0
b=20 or b=25
c)a×b=18
a+b=9
a=9-b
(9-b)b=18
9b-b²=18
b²-9b+18=0
b²-6b-3b+18=0
b(b-6)-3(b-6)=0
(b-3)(b-6)=0
b=3 or b=6
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