Q. What is the value of the expression below when z=3 ?6z2−5z+3Answer:
Substitute z=3: Substitute the value of z into the expression.We are given the expression 6z2−5z+3 and we need to find its value when z=3.Substitute z=3 into the expression: 6(3)2−5(3)+3.
Calculate square of z: Calculate the square of z.Calculate (3)2 which is 3×3.(3)2=9.
Multiply by 6: Multiply the result by 6. Multiply 6 by the result from Step 2. 6×9=54.
Multiply by 5: Multiply z by 5. Multiply 5 by the value of z which is 3. 5×3=15.
Combine all terms: Combine all the terms.Add and subtract the results from Step 3 and Step 4, and then add 3.54−15+3=39+3=42.
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