What substitution should be used to rewrite 4x4 – 21x2 + 20 = 0 as a quadratic equation?
2 answers:
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Answer:
we conclude that:
Hence, the last option i.e. is correct.
Step-by-step explanation:
Given the expression
Combining the radical expressions
let us first solve
Apply radical rule:
Apply radical rule:
Thus,
similarly solving
Apply radical rule:
Apply radical rule:
Thus,
so we get
so the expression becomes
∵
,
∵
Therefore, we conclude that:
Hence, the last option i.e. is correct.