Evaluate the following algebraic expressions:
18. 3 + 2 - 1, for = −2
19. 2ab -3 , for a = −1 and b=-2
20. -3xy +x-1, for x= -1 and y= 3
18. 3 + 2 - 1, for = −2
19. 2ab -3 , for a = −1 and b=-2
20. -3xy +x-1, for x= -1 and y= 3
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Answer:
18. ?
19. 1
20. 7
pa clear po nung number 18