3 years ago

Evaluate 2x2 - 1 when x = 3.

2 answers:

7 0

When x is evaluated to 3 you get 11.

2(3)2-1 = 11

6 0

X should equal 11
2(3)2-1
6(2)-1
12-1
11

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$\displaystyle \frac{3\sqrt{230}}{5}$

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Use the Pythagorean Theorem:

$\displaystyle a^2 + b^2 = c^2 \\ \\ 9,7^2 + b^2 = 13,3^2; \sqrt{82,8} = \sqrt{b^2} \\ \\ \frac{3\sqrt{230}}{5}\:[or\:9,0994505329...] = b$

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