find the value of y^2 + 1/y^2, if y -1/y = √5
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Answer:
y^2 + 1/y^2=7
Step-by-step explanation:
y-1/y=√5
squaring both sides
(y-1/y)^2=(√5)^2
y^2 + 1/y^2-2*y*1/y=5
y^2 + 1/y^2-2=5
y^2 + 1/y^2=5+2
y^2 + 1/y^2=7
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