Simplify $2 x (2 x - 3) + 5$ and find its value at $x = 2$ .

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Solution

$2 x (2 x - 3) + 5 = {4 x}^{2} - 6 x + 5$

Therefore, ${4 x}^{2} - 6 x + 5$

At, $x = 2$ ,

$4 * 2^{2} - 6 * 2 + 5 = 16 - 12 + 5 = 9$

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Similar questions

3 x (4 x - 5) + 3

x = 3

x = \frac{1}{2}

a (a^{2} + a + 1) + 5

a = 0

a = 1

a = - 1

2 x^{2} (x + 2) - 3 x (x^{2} - 3) - 5 x (x + 5)

3 x (4 x - 5) + 3

x = \frac{1}{2}

3 x (4 x - 5) + 3

x =

\frac{1}{2}

3 x (4 x - 5) + 3

x = 3

x = \frac{1}{2}

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