Please solve 4 and 5

Dear student

4 (i) (x + 3) (x + 5) = x^{2} + 5 x + 3 x + 15 = x^{2} + 8 x + 15 (ii) (x + 3) (x - 5) = x^{2} - 5 x + 3 x - 15 = x^{2} - 2 x - 15

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