Question Find the sum 784 Evaluate k=1∑7k3Substitute 7 for n into formula i=1∑ni3=4n2(n+1)2 472(7+1)2Add the numbers 472×82Factor the expression More Steps Rewrite the expression 82Rewrite the expression (23)2Rewrite the expression 23×2Calculate 26 472×26Factor the expression 2272×26Reduce the fraction More Steps Calculate 2226Use the product rule aman=an−m to simplify the expression 26−2Subtract the terms 24 72×24Multiply the terms 282Solution 784 Show Solution
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