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(a-2)²+ (3a+1)² =
= a² - 4a + 4 + 9a² + 6a + 1 =
= 10a² + 2a + 5
2)
2a (a-4) - 3 (a+3)² dla a= -2
2a (a-4) - 3 (a+3)² =
2a²-8a - 3(a²+6a+9) =
2a²-8a -3a²-6a-9 =
-a² -14a -9 =
-(-2)² -14*(-2) -9 =
-4 + 28 -9 =
28 - 13 = 15
a) 2a (a-4) - 3 (a+3)^ dla a= -2
2a (a-4) - 3 (a+3)^=2a²-8a-3(a²+6a+9)=2a²-8a-3a²-18a-27=-a²-(-26a)-27=-a²+26a-27
a=-2
-a²+26a-27=-(-2)²+26*(-2)-27=-4+(-52)-27=-4-52-27=-83
a^-4a+4+9a^+7a+1
10a^+3a+5
drugie zadanie
a) 2a (a-4) - 3 (a+3)^ dla a= -2
2a^-8a-3(a^+6a+9)
2a^-8a-3a^-18a-27
-26a-27-a^
52-27+4=29
myśle ze dobrze
^-do drugiej potęgi