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Use the identity (x+a)(x+b)=x^2+(a+b)x+a...

Use the identity `(x+a)(x+b)=x^2+(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) `(2a^2+9)(2a^2+5)` (vii) `(xyz-4)(xyz-2)`

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