If f=5, what is the value of 2f^2+8f-5?

2 Answers
May 30, 2017

85

Explanation:

2f^2 + 8f - 5

f = 5

We can now substitute f for 5 in the question.

2 xx 5^2 + 8 xx 5 - 5

2 xx 25 + 40 - 5

50 + 40 - 5

90 - 5

85

May 30, 2017

85.

Explanation:

First, plug the number in.
2 * 5^2+8 * 5-5

Then, follow the order of operations.

There are no grouping symbols, so do exponents first.
2 *25 +8 xx5-5

Multiplication is next:
50 +40 - 5

Finally, addition and subtraction.
85