Fully simplify this equation; 3x^3 - x(3x+36) = 0
The first step is to multiply out the bracket
3x3 - 3x2 - 36x = 0
Then remove the common factor 3x
3x(x2 - x - 12) = 0
Then factorise the bracket, by looking for two numbers which multiply to give -12, and add to give -1
3x(x - 4)(x + 3) = 0
RO
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15 machines work at the same rate. Together, the 15 machines can complete an order in 8 hours. 3 of the machines break down after working for 6 hours. The other machines carry on working until the order is complete. In total, how many hours does EACH