Quantcast XP Math - Forums - View Single Post - help with some math questions?
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Old 08-07-2007   #2
Tony The Dad
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#1) 2x^4 - 3x^2 + -4=02(x²)² - 3x² -4 = 0Substitute x^2 with q:2q² - 3q - 4 = 0Use quadratic formula (using q instead of x)q = (-(-3)±√((-3)²-4·2·(-4)))/(2·2) = (3 ±√(9+32))/4 = (3 ±√(41))/4Substitute x² for q:x² = (3 ±√(41))/4x = ±√((3 ±√(41))/4)You'll get 2 imaginary answers and 2 real answers.