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Verified answer
A)9x + by - 10y - 8x
= 9x - 8x + by - 10y
= x + (b - 10)y
b)
x² + 8y² - 16 + 10x² - 7y² + 11
= x² + 10x² + 8y² - 7y² - 16 + 11
= 11x² + y² - 5
c)
18a - 5(a - 3b)
= 18a - 5a + 15b
= 13a + 15b
d)
12 + 2(4x - 3)
= 12 + 8x - 6
= 8x + 12 - 6
= 8x + 6
e)
a(a + 3b) + 2a(4a + 5b)
= a² + 3ab + 8a² + 10ab
= a² + 8a² + 3ab + 10ab
= 9a² + 13ab