=49a^2+14ab-8b^2-b^2+b^2=(
49a^2+14ab+b^2)-9b^2=(7a+b)^2-9b^2 =(7a+b-3b)(7a+b+3b)=(7a-2b)(7a+4b)
X³-3x²-8x+24=0
(x³-3x²)-8(x-3)=0
x²(x-3)-8(x-3)=0
(x-3)(x²-8)=0
(x-3)(x-√8)(x+√8)=0
(x-3)(x-2√2)(x+2√2)=0
x-3=0 или х-2√2=0 или х+2√2=0
х₁=3 х₂=2√2 х₃=-2√2
<span>32,3 * 3/8 + 7,7 * 3/8=3\8(32,3+7,7)=3\8*40=3\1*5=15</span>