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受欢迎的代数 >

(5x+9)^2+9=49

解答

(5 x + 9)^{2} + 9 = 49

解答

x = \frac{2 10 - 9}{5}, x = \frac{- 2 10 - 9}{5}

+1

十进制

x = - 0.53508 \dots, x = - 3.06491 \dots

求解步骤

(5 x + 9)^{2} + 9 = 49

将

9

到右边

(5 x + 9)^{2} = 40

对于

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

解为

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

解

5 x + 9 = 40 : x = \frac{2 10 - 9}{5}

解

5 x + 9 = - 40 : x = \frac{- 2 10 - 9}{5}

二次方程组的解是:

x = \frac{2 10 - 9}{5}, x = \frac{- 2 10 - 9}{5}

作图

流行的例子

\frac{1}{3} x^{2} = 12

solvefor x,x^2+2xy+3y^2=4

so l v e f or x, x^{2} + 2 x y + 3 y^{2} = 4

8 n^{2} - 16 n + 66 = - 2

5 = x^{2} + 1

因式分解 7r^2-14r=-7

f a c t or 7 r^{2} - 14 r = - 7