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Sagot :
Answer:
a. x = 2 , x = -5
b. no real roots
Step-by-step explanation:
a. x² + 3x – 10
= x² - 2x + 5x - 10
= x (x²/x - 2x/x) + 5 (5x/5 - 2*5/5)
= (x - 2) (x + 5)
x - 2 = 0 x + 5 = 0
+ 2 +2 -5 -5
-------------- ---------------
x = 2 x = -5
x = 2 , x = -5
b. 2x² - 4x + 3
This can't be solved because the equation has no real roots, and also the discriminant is negative.
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