perform the operation please I need it grade 7 worksheet phs labas patulong naman
Answer:
18. (8a+4) + (-3a+7)
= -24a² -68a -28
19. (12z²-11z) + (4z-6)
=48z³- 116z² +66z
20. (-20a² + 5ab + 4) + ( 3ab + 7a²)
=35a³b + 5a²b² + 12ab – 60a³ – 140a⁴ + 28a²
22. (-18x+3y) – (3x-5y)
= -54x² – 99xy + 15y²
23. (y³-2y+13) – (-5y³+7y-14)
= -5y^6 – 17y⁴ + 51y³ + 14y² + 63y + 182
24. (12m+4n-9) – (3n+6-13m)
= 88mn – 156m² – 12n² – 189m + 51n + 36
Step-by-step explanation:
18. (8a+4) + (-3a+7)
=(-24a-56) + (-12a-28)
= -24a² -56a -12a -28
=-24a² -68a -28
19. (12z²-11z) + (4z-6)
= (48z³ – 72z²) + (44z² +66z)
=48z³- 116z² +66z
20. (-20a² + 5ab + 4) + ( 3ab + 7a²)
= -60a³ – 140a⁴ + 5a²b² + 35a³b + 12ab +28a²
=35a³b + 5a²b² + 12ab – 60a³ – 140a⁴ + 28a²
22. (-18x+3y) – (3x-5y)
=(-54x² – 90xy) – ( 9xy-15y²)
= -54x² – 90xy -9xy + 15y²
= -54x² – 99xy + 15y²
23. (y³-2y+13) – (-5y³+7y-14)
= (-5y^6 -7y⁴ -14y³) – (10y⁴ -14y² + 28y) – (-65y³ – 91y – 182)
= -5y^6 – 7y⁴ – 14y³ – 10y⁴ + 14y² – 28y + 65y³ + 91y + 182
= -5y^6 – 17y⁴ + 51y³ + 14y² + 63y + 182
24. (12m+4n-9) – (3n+6-13m)
=(36mn – 72m – 156m²) – (12n² – 24n – 52mn) – (-27n -36 + 117m)
= 36mn – 72m – 156m² – 12n² + 24n + 52mn + 27n + 36 – 117m
= 88mn – 156m² – 12n² – 189m + 51n + 36
(Hilong-hilo ako katatype dito, ghad)
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