Mathematics
Senior High
Solved
3行目から4行目の後半がなぜこうなるのか分からないので教えてください
b
ax² + bx + c = a (x² + ·
·a (x² + 1
=a {( x
= a(x +
a(x+
=ax+
+
a
x ) +
2
b
c
b
+c
20 ) ² - ( 20 ) } + 0
2a
b 2
2a
b
2 a)² -a (2a)²=
2a
b
2a
2
b2-4ac
4a
+c
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