PROSZE O POMOC:) 1) Rozwiąz rownanie : 2[(x-4)[latex] ^{2} [/latex]-3(x+1)[latex] ^{2} [/latex]+4(4x-2)(4x+2)]-28[latex] x^{2} [/latex]=19-27x 2) Rozwiąz rownanie kwadratowe : [latex] x^{2} [/latex]-x-6=0

1. 2[(x - 4)^2 - 3(x + 1)^2 + 4(4x - 2)] - 28x^2 = 19 - 27x 2[x^2 - 8x + 16 - 3(x^2 + 2x + 1) + 4(16x^2 - 16x + 4)] - 28x^2 = 19 - 27x 2[x^2 - 8x + 16 - 3x^2 - 6x - 3 + 64x^2 - 64x + 16] - 28^2 = 19 - 27x 2x^2 - 16x + 32 - 6x^2 - 12x - 6 + 128x^2 - 128x + 32 - 28^2  = 19 - 27x 102x^2 - 156x + 58 = 19 - 27x 102x^2 - 156x + 58 - 19 + 27x = 0 102x^2 - 129 + 39 = 0 delta = (-129)^2 - 4 * 102 * 39 = 16641 - 15912 = 729 pier. z 729 = 27 x1 = 129-27/2*102 = 102/204 = 51/102 = 17/34 x2 = 129+27/2*102 = 3483/204 = 1741/102 = 17 7/102 2. x^2 - x - 6 = 0 delta = (-1)^2 - 4 * 1 * (-6) = 1 + 16 = 17 pier. z delty = pier. z 17 x1 = 1 - pier. z 17/2*1 = 1 - pier. z 17/2 x2 = 1 + pier. z 17/2*1 = 1 + pier. z 17/2 Myślę, że pomogłam :)