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受欢迎的代数 >

13+x^3=7x^2+13

解答

13 + x^{3} = 7 x^{2} + 13

解答

x = 0, x = 7

求解步骤

13 + x^{3} = 7 x^{2} + 13

将

13

到右边

x^{3} = 7 x^{2}

将

7 x^{2}

para o lado esquerdo

x^{3} - 7 x^{2} = 0

因式分解

x^{3} - 7 x^{2} : x^{2} (x - 7)

x^{2} (x - 7) = 0

使用零因数法则： If

ab = 0

then

a = 0

or

b = 0

x = 0 or x - 7 = 0

解

x - 7 = 0 : x = 7

解为

x = 0, x = 7

作图

流行的例子

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