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b) 2x² - y ( x + 1 )=2*(-2)2 - 5(-2+1)=2*4+10-5=13
c) (m + 1)(n - 2) =(2+1)(1-2)=2-4+1-2=-3
1-2 = -1
b. 2x² - y ( x + 1 ) dla x = -2 i y = 5
2*(-2)^ - 5(-2 + 1)
2*4 + 10 - 5
8 + 10 - 5 = 13
c. (m + 1)(n - 2) dla m = 2 i n = 1
(2 + 1) (1-2)
2+4+1-2 = 5