Question

Ex 6 va rog repede dacă se poate ​

Answer 1

Răspuns:

Explicație pas cu pas:

6. Folosesti a^2 - b^2 = (a - b)(a + b)

9x^2 - 5 = (3x - √5)(3x + √5)

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3x^2 - 4 = (x√3 - 2)(x√3 + 2)

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x^2/4 - 1/9 = (x/2 - 1/3)(x/2 + 1/3)

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25x^2/49 - 36 = (5x/7 - 6)(5x/7 + 6)

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25/16 - x^2 = (5/4 - x)(5/4 + x)

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x^2/9 - 1/25 = (x/3 - 1/5)(x/3 + 1/5)

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1/16 - 5x^2 = (1/4 - x√5)(1/4 + x√5)

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4/9 - 3x^2 = (2/3 - x√3)(2/3 + x√3)

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16/49 - 7x^2 = (4/7 - x√7)(4/7 + x√7)

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2x^2 - 1/25 = (x√2 - 1/5)(x√2 + 1/5)

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8x^2 - 1/81 = (2√2x - 1/9)(2√2x + 1/9)