Question

factorise 9a^4-a^2-12a-36​

Answer 1

Answer ⤵️

$9 {a}^{4} - {a}^{2} - 12a - 36 = 0\\ = 8 {a}^{2} - 12a - 36 = 0 \\ = 8 {a}^{2} - (24a - 12a) - 36 = 0 \\ = 8 {a}^{2} - 24a + 12a - 36 = 0 \\ = 8a(a - 3) + 12(a - 3) = 0 \\ = (a - 3)(8a + 12) = 0 \\ a - 30 \\ a = 3 \\ 8a + 12 = 0 \\ 8a = - 12 \\ a = \frac{ - 12}{8} = \frac{6}{4} = \frac{3}{2} \\ \\ so \: a = 3 \: or \: a = \frac{3}{2}$

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Answer 2

Answer:

9a ^ 4 - a ^ 2 - 12a - 36

Step-by-step explanation: