1-9x^{2} - rozłóż na czynniki
1-9x^2=(1-3x)(1+3x)
1 - 9x² = 1² - (3x)² = (1 - 3x)(1 + 3x)
a² - b² = (a - b)(a + b) --- wzór
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1-9x^2=(1-3x)(1+3x)
1 - 9x² = 1² - (3x)² = (1 - 3x)(1 + 3x)
a² - b² = (a - b)(a + b) --- wzór