if a + 2b = 5 , and ab = 2, find a^2 + 4b^2
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Step-by-step explanation:
a+2b=5
Ab=2 a=2/b
2/b+2b=5
2+2b^2/b=5
2+2b^2=5b
2b^2-5b+2=0
b=1/2, 2
a+2b=5
a+2(1/2) =5
a=4
a+2b=5
a+2(2) =5
a=1
When b=2, a=1
When b=1/2, a=4
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