Question

factorise 7 a2 + 7 a – 42

Answer 1

$\solution \ :$

$= = = = = = = = = = = = = = = = = = = = = =$

$=> 7 \: a^{2} + 7a - 42 = 0$

$= > 7a ^{2} + 21a - 14a - 42 = 0$

$= > 7a(a + 3) - 14(a + 3) = 0$

$=> (7a - 14)(a + 3) = 0$

$7a - 14 = 0 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: a + 3 = 0$

$7a = 14 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:\: \: \: a = - 3$

$a = \frac{14}{7}$

$a = 2$

$= = = = = = = = = = = = = = = = = = = = = =$

$hope \: it \: helps \: u \\ pls \: mark \: me \: as \: brainliest$

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