91軸 x=-1,
頂点→(-1,2)
早田(2)軸→x=-2
頂点→(-2,-4)
(3)軸→x=1,
頂点
(1,2)
(4)軸
x=2
頂点→(2,-1)
2
10 (1) x²+8x
=(x+4)2-16.
(2)x²-6x+8
=(x+4)2-42
=297=2.3x+8
=(x-3)-9+8
=(x-3)-V
1312x²-8x+5
=2(x²-4)+5
=2{(x-2)^2-22}+5
=2(x-2)2-22+5
=2(x-2)2+1
=2(x-2P-8+5←
=2(x-2)2-3.
+