bonjour
a = x² + x - x - 5
= x² - 5
b = 20 x - 36 - 10 x² + 18 x
= - 10 x² + 38 x - 36
c = - x² + x + x - 1
= - x² + 2 x - 1
d = 18 + 9 x + 12 x + 6 x²
= 6 x² + 21 x + 18
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bonjour
a = x² + x - x - 5
= x² - 5
b = 20 x - 36 - 10 x² + 18 x
= - 10 x² + 38 x - 36
c = - x² + x + x - 1
= - x² + 2 x - 1
d = 18 + 9 x + 12 x + 6 x²
= 6 x² + 21 x + 18