X-7²+X*5=28X помогите уравнение решить

x² - 7² + 5x = 28x
x² - 49 + 5x = 28x
x² + 5x - 28x - 49 = 0
x² - 23x - 49 = 0
a = 1, b = -23, c = -49
d = b² - 4ac
d = (-23)² - 4 * 1 * (-49)
d = 529 + 196
d = 725
√d = √725
√725 = √(25 * 29) = 5√29
x = (-b ± √d) / (2a)
x = ( -(-23) ± 5√29 ) / (2 * 1)
x = ( 23 ± 5√29 ) / 2
x₁ = (23 - 5√29) / 2
x₂ = (23 + 5√29) / 2