=13(x^2+30x-5400/13)
=13(x^2+30x+225-8325/13)
\(=13\left(x+15-\sqrt{\dfrac{8325}{13}}\right)\left(x+15+\sqrt{\dfrac{8325}{13}}\right)\)
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=13(x^2+30x-5400/13)
=13(x^2+30x+225-8325/13)
\(=13\left(x+15-\sqrt{\dfrac{8325}{13}}\right)\left(x+15+\sqrt{\dfrac{8325}{13}}\right)\)