Why it matters
Many equations aren't quadratic in but are quadratic in something else. Spotting the hidden quadratic turns a hard equation into a routine one. You will use this again with exponentials, logarithms and trigonometric equations.
A-LEVEL•Mathematics•Quadratics•1.5 Disguised Quadratics
Why it matters
Solve equations that are quadratic in x^2, sqrt(x), 1/x or 2^x by substitution.
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