polti
polti
20-03-2018
Mathematics
contestada
Factorise x^2 + 3x -40
Respuesta :
jdoe0001
jdoe0001
20-03-2018
notice, all we do is "prime factor" 40, and use the factors about to add them and get the middle coefficient of 3, and since they're factors, their product will give us 40 back.
[tex]\bf x^2\stackrel{8-5}{+3}x\stackrel{(8)(-5)}{-40}\implies (x+8)(x-5)[/tex]
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