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受欢迎的代数 >

9(7-5x)^2-3=22

解答

9 (7 - 5 x)^{2} - 3 = 22

解答

x = \frac{16}{15}, x = \frac{26}{15}

+1

十进制

x = 1.06666 \dots, x = 1.73333 \dots

求解步骤

9 (7 - 5 x)^{2} - 3 = 22

将

3

到右边

9 (7 - 5 x)^{2} = 25

两边除以

9

(7 - 5 x)^{2} = \frac{25}{9}

对于

(g (x))^{2} = f (a)

解为

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

解

7 - 5 x = \frac{25}{9} : x = \frac{16}{15}

解

7 - 5 x = - \frac{25}{9} : x = \frac{26}{15}

二次方程组的解是:

x = \frac{16}{15}, x = \frac{26}{15}

作图

流行的例子

(20-n)(20+n)=391

(20 - n) (20 + n) = 391

因式分解 5x^2-60x=0

f a c t or 5 x^{2} - 60 x = 0

2 x^{2} - 13 x + 18 = 0

x^{2} + 3 x = - 8

solvefor x,f=(xy-1)^2

so l v e f or x, f = (x y - 1)^{2}