1.

Factorise x^2+13x+5​

Answer»

{x}^{2}  + 13x + 5 = 0 \\  \\ a = 1 \: \\  b = 13 \:  \\  c= 5 \\  \\ x =  (- b +  -  \sqrt{ {b }^{2}  - 4ac })  \div (2a) \\   =  (- 13 +  -  \sqrt{149})  \div 2 \\  \\ x =  - 12.6 \\ x =  - 0.3967

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