Bonsoir,
25x² + 1 - 10x = (5x)² + 1² - 2(5x) = (5x-1)²
2(x+3) + x² - 9 = 2(x+3) + x² - 3²
= 2(x+3) + (x+3)(x-3)
= (x+3)(2+x-3)
= (x+3)(x-1)
x² + 8x + 16 = x² + 2(4)(x) + 4² = (x+4)²
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Bonsoir,
25x² + 1 - 10x = (5x)² + 1² - 2(5x) = (5x-1)²
2(x+3) + x² - 9 = 2(x+3) + x² - 3²
= 2(x+3) + (x+3)(x-3)
= (x+3)(2+x-3)
= (x+3)(x-1)
x² + 8x + 16 = x² + 2(4)(x) + 4² = (x+4)²