Find all real sollutions of the equation exactly.y^4 - 7y^2 + 6 = 0
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To solve this problem, you should use a dirty trick: "see" this problem as a quadratic in some variable. Do you follow me?
Originally Posted by Ackbeet To solve this problem, you should use a dirty trick: "see" this problem as a quadratic in some variable. Do you follow me? I don't know what you mean. Can you show me what to do? Can you show me the steps?
Let $\displaystyle y^2 = Y$. What happens to the equation?
Originally Posted by Prove It Let $\displaystyle y^2 = Y$. What happens to the equation? The equation becomes quadratic, right?
Correct. What quadratic do you get? Remember that $\displaystyle y^4 = (y^2)^2$.
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