Question

multiple the following (x-4)(x+9)​

Answer 1

Identity :

(x - a) ( x + b ) = x² + ( a + b )x + 2ab

=> (x - 4)(x + 9) = x² + ( -4 + 9)x + 2 × - 4 + 9

=> x² + 5x - 54

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Answer 2

$\tt{ \red{(x - 4)( x + 9)}}$

According to the identity,

[ (x+a)(x+b) = x² + (a+b)x + ab ]

$\: \: \: \: \: \: \: \: \: \: \: \tt{ {x}^{2} + ( - 4 + 9)x + ( - 4)(9) } \\ \\ \implies \tt{ \boxed{ \pink{{x}^{2} + 5x - 36}}}$

hope it's helpful ✅✅✅