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Algebra Level 1

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The answer is 34.

Shelly Ding by Shelly Ding , 20, China

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4 solutions

Mohammad Khaza
Jul 23, 2017

f(x)= x 2 + 2 x − 1 x^2 + 2x -1 and x = 5 x=5

so, x 2 + 2 x − 1 x^2 + 2x -1

= 5 2 + 5 × 2 − 1 5^2 +5\times 2 -1

= 34 34

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Nindia Sharma
Sep 28, 2015

X^2+2X-1
5 5 + 2 5 - 1
25 + 10 - 1
35 - 1
34



1 Helpful 0 Interesting 0 Brilliant 0 Confused

I calculated this mentally. It took me less than a minute.

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Nikhil Raj
May 30, 2017

Given, f ( x ) = x 2 + 2 x − 1 f ( 5 ) = 5 2 + 2 × 5 − 1 = 25 + 10 − 1 = 34 f(x) = x^2 + 2x -1 \\ f(5) = 5^2 + 2 \times 5 - 1 = 25 + 10 - 1 = \color{#624F41}{\boxed{34}}

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