Question

Evaluate the expression for the given value.

3x(x−2), when x=7 .

Answer 1

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Given,

`x = 7`

Substitute the value of 'x' in the equation 3x (x - 2).

One way :-

`3x(x - 2) \\ = 3 * 7(7 - 2) \\ = 21(5) \\ = 21 * 5 \\ = 105`

Second way :-

`3x(x - 2) \\ = 3x {}^(2) - 6x \\ = 3 * (7) {}^(2) - 6(7) \\ = (3 * 49) - (6 * 7) \\ = 147 - 42 \\ = 105`

✐ The answer is 105.

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