✔ 最佳答案
17x^2 + 70x - 552 = 0
Use the quadratic equation:
x = (-b +/- sqrt(b^2 - 4ac)/2a
a = 17
b = 70
c = -552
x = (-70 +/- sqrt(70^2 - 4(17)(-552)))/2(17)
x = (-70 +/- sqrt(4900 + 37536))/34
x = (-70 +/- sqrt(42436))/34
x = (-70 +/- 206)/34
x = -276/34 or 136/34
x = -138/17 or 4
Factors:
x = -138/17
17x = -138
17x + 138 = 0
x = 4
x - 4 = 0
(17x+ 138)(x - 4) = 0
CHECK:
(17x+ 138)(x - 4) = 17x^2 + 70x - 552
17x^2 - 68x + 138x - 552 = 17x^2 + 70x - 552
17x^2 + 70x - 552 = 17x^2 + 70x - 552
CHECK