X^2+6X+9=0

解答

X^{2} + 6 X + 9 = 0

X = - 3

求解步骤

X^{2} + 6 X + 9 = 0

使用求根公式求解

X_{1, 2} = \frac{- 6 \pm 6 ^{2} - 4 \cdot 1 \cdot 9}{2 \cdot 1}

6^{2} - 4 \cdot 1 \cdot 9 = 0

X_{1, 2} = \frac{- 6 \pm 0}{2 \cdot 1}

X = \frac{- 6}{2 \cdot 1}

\frac{- 6}{2 \cdot 1} = - 3

X = - 3

二次方程组的解是:

X = - 3

15 x^{2} + 8 x - 12 = 0

0 = 40 - 5 t - 5 t^{2}

(6 x + 4)^{2} = 16

so l v e f or x, 9 x^{2} + 12 x y + 4 y^{2} - 18 x - 16 y - 11 = 0

16 x^{2} - 235 x + 151 = 0