1)140x-(25x^2-70x+49)
140x-25x^2+70x-49
210x-25x^2-49
-25x^2+210x-49
2)(√2*11 - √7*13)
√22-√91
при х=-1, у=3*(-!)-2 =-5,
<span>а)x ² +7x+12=0</span>