Please solve these fast
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Answer:
a) 8a - 2ab + 2b - 15
b) 2xy - 7yz + 5zx + 10xyz
Step-by-step explanation:
a) (12a - 9ab + 5b - 3) - (4a - 7ab + 3b + 12)
⇒ 12a - 9ab + 5b - 3 - 4a + 7ab - 3b - 12
⇒ (12a - 4a) + (5b - 3b) + (-9ab + 7ab) + (-3 - 12)
⇒ 8a + 2b - 2ab - 15
b) (5xy - 2yz - 2zx + 10xyz) - (3xy + 5yz - 7zx)
⇒ 5xy - 2yz - 2zx + 10xyz - 3xy - 5yz + 7zx
⇒ (5xy - 3xy) + (-2yz - 5yz) + (-2zx + 7zx) + 10xyz
⇒ 2xy - 7yz + 5zx + 10yz
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