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受欢迎的代数 >

9x^2=18x

解答

9 x^{2} = 18 x

解答

x = 0, x = 2

求解步骤

9 x^{2} = 18 x

将

18 x

para o lado esquerdo

9 x^{2} - 18 x = 0

因式分解

9 x^{2} - 18 x : 9 x (x - 2)

9 x (x - 2) = 0

使用零因数法则： If

ab = 0

then

a = 0

or

b = 0

x = 0 or x - 2 = 0

解

x - 2 = 0 : x = 2

二次方程组的解是:

x = 0, x = 2

作图

流行的例子

h^{2} + 2 h - 5 = 0

solvefor x,x^2-x-56=0

so l v e f or x, x^{2} - x - 56 = 0

solvefor x,2x^2-4xy+3y^2=1

so l v e f or x, 2 x^{2} - 4 x y + 3 y^{2} = 1

6 x^{2} + x + 7 = 0

3 x^{2} + 13 x + 14 = 2