alpha ,beta are roots of y^2-2y-7=0 find,(1) alpha^2+beta^2
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alpha^2+beta^2=(alpha+beta)^2-2*alpha*beta
(-(-2/1))^2-2*(-7/1)
=(2/1)^2-2(-7)
=4+14
=18
(-(-2/1))^2-2*(-7/1)
=(2/1)^2-2(-7)
=4+14
=18
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