Use factor method to evaluate:
(5z2 - 80) ÷ (z - 4)
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Factorise :
15(2x - y)2 - 16(2x - y) - 15
Evaluate (using factors) : 3012 x 300 - 3003
10y(6y + 21) ÷ (2y + 7)
(a2 - 14a - 32) ÷ (a + 2)