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受欢迎的代数 >

4(7-7x^2)=7

解答

4 (7 - 7 x^{2}) = 7

解答

x = \frac{3}{2}, x = - \frac{3}{2}

+1

十进制

x = 0.86602 \dots, x = - 0.86602 \dots

求解步骤

4 (7 - 7 x^{2}) = 7

两边除以

4

7 - 7 x^{2} = \frac{7}{4}

将

7

到右边

- 7 x^{2} = - \frac{21}{4}

两边除以

- 7

x^{2} = \frac{3}{4}

对于

x^{2} = f (a)

解为

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

x = \frac{3}{4}, x = - \frac{3}{4}

\frac{3}{4} = \frac{3}{2}

- \frac{3}{4} = - \frac{3}{2}

x = \frac{3}{2}, x = - \frac{3}{2}

作图

流行的例子

quadraticformula 2x^2+x-3=0

q u a d r a t i c f or m u l a 2 x^{2} + x - 3 = 0

x (x - 7) = 2 x

x (x - c) = a

9.81t^2-24t-140=0

9.81 t^{2} - 24 t - 140 = 0

g^{2} + 34 = - 135