Question

3 - a (4 + 7a) factorise​

Answer 1

Answer:

$3 - a(4 + 7a) = 3 -4a - 7 {a}^{2}$

$- 7 {a}^{2} - 4a + 3$

$- 7 {a}^{2} - 7a + 3a + 3$

$- 7a(a + 1) + 3(a + 1)$

$(a + 1)( 3 - 7a)$

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