Factorise x^3 – 15x^2 + 71x - 105
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Step-by-step explanation:
sum of zeroes = -b/a
a-d+a+a+d 15
3a =15
a= 5
product of zeroes =-d/a (a-d)(a+d)a=105
a^2-d^2=105/5
25-d^2=21
4=d^2 a=5
d=2
a-d +5-2=3
a+d=5+2=7
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