r^2=144

解答

r^{2} = 144

r = 12, r = - 12

求解步骤

r^{2} = 144

对于

x^{2} = f (a)

解为

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

r = 144, r = - 144

144 = 12

- 144 = - 12

r = 12, r = - 12

j (x) = - x^{2} + 3 x + 10, j (3 x - 2)

8 = 2 x^{2} - 5

5 x (x - 3) + 9 = - 2 x (x - 3) + 7 x - 2

(x + 9)^{2} = - x - 7

6 x^{2} - 972 = 0