Q. What is the value of the expression below when w=3 ?3w2−8w+7Answer:
Substitute value of w: Substitute the value of w into the expression.We are given w=3, so we substitute 3 for w in the expression 3w2−8w+7.3(3)2−8(3)+7
Calculate square of w: Calculate the square of w, which is 3 in this case.(3)2=3×3=9
Multiply result by 3: Multiply the result from Step 2 by 3. 3×9=27
Multiply 8 by w: Multiply 8 by w, which is 3. 8×3=24
Combine and add 7: Combine the results from Step 3 and Step 4 and add 7. 27−24+7
Perform subtraction and addition: Perform the subtraction and addition to find the final value.27−24=33+7=10
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