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Write the terms of the sequence 5 × (1 + 6), 10 × (2 + 6), 15 × (3 + 6), 20 × (4 + 6) in the form : first term 5 × 1(1 + 6), second term 5 × 2(2 + 6). Write its algebraic expression |
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Answer» 5 x (1 + 6), 10 x (2 + 6), 15 x (3 + 6), 20 x (4 + 6), … this sequence can be written as 5 x 1(1 + 6), 5 x 2 (2 + 6), 5 x 3 (3 + 6), 5 x 4 (4 + 6). Algebraic expression = 5 x n (n + 6) i.e. xn = 5n2 + 30n |
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