x^2=20^2+15^2

解答

x^{2} = 2 0^{2} + 1 5^{2}

x = 25, x = - 25

求解步骤

x^{2} = 2 0^{2} + 1 5^{2}

化简

2 0^{2} + 1 5^{2} : 625

对于

x^{2} = f (a)

解为

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

x = 625, x = - 625

625 = 25

- 625 = - 25

x = 25, x = - 25

x^{2} + 2 (3) x - 3 = (3) x^{2} + 1

(x + 4)^{2} + 6 = 7 (x + 4)

- 4.9 t^{2} + 13 t + 18 = 0

25 x^{2} + 1 = 20 x

\frac{1}{2} c^{2} + 3 c = 1