Question

24. Expand using suitable identity
(x + 9) (x + 10)​

Answer 1

$(x + a) +(x + b) = {x }^{2} + (a + b )x + ab \\ \\ (x + 9)(x + 10) \\ {x}^{2} + (9 + 10)x + 9 \times 10 \\ {x}^{2} + 19x + 90$

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Answer 2

Answer : x = -9 , x = -10

Step-by-step explanation:

(x + 9),( x + 10) =0

Therefore,

(x + 9) = 0,(x + 10) = 0

x = -9 , x = -10