X² +xy -x² -2xy = -xy = -(√12 *√3) = -(√(12*3) = -√36 = -6
А) –2 < х < 4
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_____(-2)____________(4)_____
б) 0 < х 15
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______(0)_______________(15)________
D=400-1*51=49
x1=-20+7/2=6,5
x2=-20-7/2=13,5
ответ:6,5;13,5
Cложи степени X^5*X^7=X^12