factorise the expression and divide then 42(a⁴-13a³+36a²) by 7a(a-4)
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42(a⁴-13a³+36a²) / 7a(a-4)
6(a⁴-13a³+36a²) / a(a-4)
6[a²(a²-13a+36)] /a(a-4)
6[a²(a²-9a-4a+36)] / a(a-4)
6[a²{a(a-9)-4(a-9)}] / a(a-4)
6[a²(a-9)(a-4)] / a(a-4)
6a²(a-9)(a-4) / a(a-4)
6a(a-9)
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