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受欢迎的代数 >

(2x+7)(x^2-15)=0

解答

(2 x + 7) (x^{2} - 15) = 0

解答

x = - \frac{7}{2}, x = - 15, x = 15

+1

十进制

x = - 3.5, x = - 3.87298 \dots, x = 3.87298 \dots

求解步骤

(2 x + 7) (x^{2} - 15) = 0

因式分解

(2 x + 7) (x^{2} - 15) : (2 x + 7) (x + 15) (x - 15)

(2 x + 7) (x + 15) (x - 15) = 0

使用零因数法则： If

ab = 0

then

a = 0

or

b = 0

2 x + 7 = 0 or x + 15 = 0 or x - 15 = 0

解

2 x + 7 = 0 : x = - \frac{7}{2}

解

x + 15 = 0 : x = - 15

解

x - 15 = 0 : x = 15

解为

x = - \frac{7}{2}, x = - 15, x = 15

作图

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