Pomocy błagam uprosc wyrażenie (2a+3) do potei 2. -3(a+3) (a-3). B) (x+3)(x-3) - (x+4) do pot. 2 + (5x-1) do pot. 2 prosze
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1) (2a + 3)² - 3(a+3)(a-3) =
= 4a² + 12a + 9 - 3(a² - 9) =
= 4a²+12a + 9 - 3a² + 27=
= a² +12a + 36
2)
(x+3)(x-3) - (x+4)² + (5x - 1)² =
= x² - 9 -(x² + 8x + 16) + 25x² - 10x + 1=
=x² - 9 -x² - 8x - 16 + 25x² -10x + 1 =
=25x² - 18x - 24
(a+b)² = a² + 2ab + b²
(a-b)² = a² -2ab + b²
(a-b)(a+b) = a² - b²
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