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Mathematics

If 5x + 1 = 25x - 2; find the value of :

3x - 3 × 23 - x.

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Answer

Given,

⇒ 5x + 1 = 25x - 2

⇒ 5x + 1 = (52)x - 2

⇒ 5x + 1 = 52(x - 2)

⇒ x + 1 = 2(x - 2)

⇒ x + 1 = 2x - 4

⇒ 2x - x = 1 + 4

⇒ x = 5.

Substituting value of x in 3x - 3 × 23 - x, we get :

⇒ 3x - 3 × 23 - x = 35 - 3 × 23 - 5

= 32 × 2(-2)

= 9×122=94=2149 \times \dfrac{1}{2^2} = \dfrac{9}{4} = 2\dfrac{1}{4}.

Hence, 3x - 3 × 23 - x = 2142\dfrac{1}{4}.

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