x²-ax+4分之a²-b²=0x²-bx-2x²=0这两道题都用因式分解法解还有不要瞎搞随便找到题复制了答案就过来

Question

x²-ax+4分之a²-b²=0 x²-bx-2x²=0 这两道题都用因式分解法解
还有不要瞎搞 随便找到题复制了答案就过来

Answer 1

x” - ax + (a"/4) - b” = 0,
4x" - 4ax + a" - 4b” = 0,
( 2x - a )” - (2b)” = 0,
( 2x - a - 2b )( 2x - a + 2b ) = 0,
( x - a/2 - b )( x - a/2 + b ) = 0,
解方程得,
x1 = a/2 + b,
x2 = a/2 - b,
x” - bx - 2x” = 0,
-x” - bx = 0,
-x( x + b ) = 0,⺁
解方程得,
x1 = 0,
x2 = -b,