Rozwiąż równanie wymierne
/potrzebne na wczoraj. :P
5(x^2-1)-8(x^2-4) / (x^2-4)(x^2-1) = 2(x^2+3x+2)-20(x^2-3x+2) / (x^2-3x+2)(x^2+3x+2)
5x^2-5-8x^2+32 / x^4-x^2-4x^2+4 = 2x^2+6x+4-20x^2+60x-40 / x^4+3x^3+2x^2-3x^3-9x^2-6x+2x^2+6x+4
-3x^2+27 / x^4-5x^2+4 = -18x^2+66x-36 / x^4-5x^2+4 /*(x^4-5x^2+4)
-3x^2+27 = -18x^2+66x-36
15x^2-66x+63=0 /:3
5x^2-22x+21=0
DELTA=484-420=64
Pierwiastek z delta=8
x1 = 22-8 / 10 = 1,4
lub
x2 = 22+8 / 10 = 3
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5(x^2-1)-8(x^2-4) / (x^2-4)(x^2-1) = 2(x^2+3x+2)-20(x^2-3x+2) / (x^2-3x+2)(x^2+3x+2)
5x^2-5-8x^2+32 / x^4-x^2-4x^2+4 = 2x^2+6x+4-20x^2+60x-40 / x^4+3x^3+2x^2-3x^3-9x^2-6x+2x^2+6x+4
-3x^2+27 / x^4-5x^2+4 = -18x^2+66x-36 / x^4-5x^2+4 /*(x^4-5x^2+4)
-3x^2+27 = -18x^2+66x-36
15x^2-66x+63=0 /:3
5x^2-22x+21=0
DELTA=484-420=64
Pierwiastek z delta=8
x1 = 22-8 / 10 = 1,4
lub
x2 = 22+8 / 10 = 3