if a + b = 24 and ab = 2 - 12 then the value of a minus b equals to
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a+b=24
square on both sides
(a+b)^2=(24)^2
a^2+b^2+2ab=576
a^2+b^2+2(2-12)=576
a^2+b^2+2(-10)=576
a^2+b^2-20=576
a^2+b^2=576+20
a^2+b^2=596
(a-b)^2=a^2+b^2-2ab
=596-2(-10)
=596+20
a+b =[616]^1/2
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