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12 questions from this quiz
To break complex equations into simpler pieces
u=x2u = x^2u=x2
u=sqrtxu = sqrt{x}u=sqrtx
u=3u = 3u=3
x=pmsqrt3x = pmsqrt{3}x=pmsqrt3
(u+10)(u−2)=0(u + 10)(u - 2) = 0(u+10)(u−2)=0
Square roots must be positive
x=4x = 4x=4
Both values of uuu are negative
There are no real roots
Substitute a simpler variable for complex term
Substitute back to find xxx
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