Question

verify the indentity (x+a) (x+b) = x^2 + (a+b)x+ ab a= 2 ,b =3 ,x= 4

Answer 1

$(x + a)(x + b) = x^{2} + (a + b)x + ab \\ (4 + 2)(4 + 3) = 4^{2} + (3 + 2)4 + 2 \times 3 \\ 6 \times 7 = 16 + 5 \times 4 + 6 \\ 42 = 16 + 20 + 6 \\ 42 = 36 + 6 \\ 42 = 42$

Answer 2

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