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Use the identity (x+a)(x+b)=x^2+(a+b)x+ab to find the following products: (i) (x+3)(x+7)

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Use the identity (x+a)(x+b)=x2+(a+b)x+ab to find the following products:

(i) (x+3)(x+7)
(ii) (4x+5)(4x+1)
(iii) (4x-5)(4x-1)
(iv) (4x+5)(4x-1)
(v) (2x+5y) ( 2x+3y)
(vi) (2a2+9)(2a2+5)
(vii) (xyz-4) (xyz-2)

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Solution:

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