Q. Evaluate the summation below.3m=0∑4(2m2−6)Answer:
Understand Summation Notation: First, we need to understand the summation notation. The expression 3∑m=04(2m2−6) means that we will substitute m with each integer from 0 to 4 into the expression (2m2−6), sum all the resulting values, and then multiply the sum by 3.
Substitute m=0: Let's start by substituting m=0 into the expression (2m2−6). This gives us 2(0)2−6, which simplifies to 0−6, resulting in −6.
Substitute m=1: Next, substitute m=1 into the expression (2m2−6). This gives us 2(1)2−6, which simplifies to 2−6, resulting in −4.
Substitute m=2: Now, substitute m=2 into the expression (2m2−6). This gives us 2(2)2−6, which simplifies to 2(4)−6, resulting in 8−6, which is 2.
Substitute m=3: Substitute m=3 into the expression (2m2−6). This gives us 2(3)2−6, which simplifies to 2(9)−6, resulting in 18−6, which is 12.
Substitute m=4: Finally, substitute m=4 into the expression (2m2−6). This gives us 2(4)2−6, which simplifies to 2(16)−6, resulting in 32−6, which is 26.
Add Substitution Results: Now, we add all the values obtained from the substitutions: −6+(−4)+2+12+26. This results in a sum of 30.
Multiply by 3: The last step is to multiply the sum by 3, as indicated by the expression 3Σ. So we calculate 3×30, which equals 90.
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