of a3−5a para a=−2b) x2−2y para x=−3ey=59) 3a2−b2 para a=−2ab=−4ds 5a2+3a b para a=−3ab=4e) a2+4a para a=23
≈3.11
Step 1 :a3−5a when a=−2 is (−2)3−5(−2)
Step 2 :=−8+10
Step 3 :2
Step 4 :x2−2y when x=−3 and y=5 is (−3)2−2(5)
Step 5 :=9−10
Step 6 :−1
Step 7 :3a2−b2 when a=−2 and b=−4 is 3(−2)2−(−4)2
Step 8 :=3(4)−16
Step 9 :−4
Step 10 :5a2+3a when a=−3 is 5(−3)2+3(−3)
Step 11 :=5(9)−9
Step 12 :36
Step 13 :a2+4a when a=23 is (23)2+4(23)
Step 14 :=49+83
Step 15 :≈3.11