1)14у*1.8 - 14у*0.3у + 21*1.8 - 21*0.3у =0
25.2у - 4.2у^2 + 37.8 - 6.3у=0
4.2у^2 - 18.9у - 37.8 = 0
14у^2 - 63у - 126 = 0
D = 3969 + 7056 = 11025 (105)
X1 = (63+105):28 = 6
X2 = (63-105):28 = -1.5
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1)14у*1.8 - 14у*0.3у + 21*1.8 - 21*0.3у =0
25.2у - 4.2у^2 + 37.8 - 6.3у=0
4.2у^2 - 18.9у - 37.8 = 0
14у^2 - 63у - 126 = 0
D = 3969 + 7056 = 11025 (105)
X1 = (63+105):28 = 6
X2 = (63-105):28 = -1.5