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受欢迎的代数 >

3x^2-2(x^2+4)=42

解答

3 x^{2} - 2 (x^{2} + 4) = 42

解答

x = 52, x = - 52

+1

十进制

x = 7.07106 \dots, x = - 7.07106 \dots

求解步骤

3 x^{2} - 2 (x^{2} + 4) = 42

乘开

- 2 (x^{2} + 4) : - 2 x^{2} - 8

3 x^{2} - 2 x^{2} - 8 = 42

同类项相加:

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

x^{2} - 8 = 42

将

8

到右边

x^{2} = 50

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

x = 50, x = - 50

50 = 52

- 50 = - 52

x = 52, x = - 52

作图

流行的例子

- 6 < 3 x - 7 < 11

化简 ((x^{1/3})/(y^{-2/3)})^9

s im pl i f y (\frac{x ^{\frac{1}{3}}}{y ^{- \frac{2}{3}}})^{9}

x^{2} = - 3 x + 40

x^4-10x^2+9>= 0

x^{4} - 10 x^{2} + 9 \geq 0

x + 4 = 20