What are the x-intercepts of the quadratic function? f (x)=x^2-3x-10

Hello : 
hello : 
f(x) = x²-3x-10
the x-intercepts solutions f(x) = 0
Δ =b²-4ac     a =1     b = -3     c = -10
Δ =(-3)²-4(1)(-10) =49 = 7²
x1 = (3-7)/2      x2 = (3+7)/2
the x-intercepts : 5 , -2

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