因式分解 (2x-5)+4x^2

解答

因式分解

(2 x - 5) + 4 x^{2}

4 (x - \frac{- 1 + 21}{4}) (x - \frac{- 1 - 21}{4})

求解步骤

(2 x - 5) + 4 x^{2}

去除括号:

(a) = a

= 2 x - 5 + 4 x^{2}

改写为

= 4 (x^{2} + \frac{x}{2} - \frac{5}{4})

因式分解

x^{2} + \frac{x}{2} - \frac{5}{4} : (x - \frac{21 - 1}{4}) (x - \frac{- 1 - 21}{4})

4 (x - \frac{21 - 1}{4}) (x - \frac{- 1 - 21}{4})

f a c t or 9 x^{2 - 18 x + 3}

f a c t or π r + 2 r

f a c t or 21 6^{6} - 27 x^{6}

f a c t or 2 mn - 4 p n + m q - 2 pq

f a c t or 5 - 19 a + 12 a