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Sedbober [7]
2 years ago
12

Evaluate 2x^2-1 when x=3

Mathematics
2 answers:
Sholpan [36]2 years ago
6 0

\sf{\qquad\qquad\huge\underline{{\sf Answer}}}

Let's evaluate ~

\qquad \sf  \dashrightarrow \: 2 {x}^{2}   - 1

plug in the value of x :

\qquad \sf  \dashrightarrow \: 2(3) {}^{2}  - 1

\qquad \sf  \dashrightarrow \: 2(9) - 1

\qquad \sf  \dashrightarrow \: 18 - 1

\qquad \sf  \dashrightarrow \: 17

The required value is 17

nexus9112 [7]2 years ago
5 0

-------------------------------------------------------------------------------------------------------------

Answer:  \textsf{Option B, 17}

-------------------------------------------------------------------------------------------------------------

Given:  \textsf{2x}^2\textsf{ - 1}

Find: \textsf{When x = 3}

Solution: In order to find the value when x is equal to 3 we just need to equate any x to the value of 3 and simplify.

<u>Plug in the values</u>

  • \textsf{2x}^2\textsf{ - 1}
  • \textsf{2(3)}^2\textsf{ - 1}

<u>Simplify the expression</u>

  • \textsf{2(3 * 3) - 1}
  • \textsf{2(9) - 1}
  • \textsf{18 - 1}
  • \textsf{17}

Therefore, the answer that would make most sense would be option B, 17.

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