Question

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Pooorfavoor

Answer 1

24) x² - 2x = 15
x²-2x -15=0

Delta= b² - 4ac
Delta= (-2)² - 4.1.(-15)
Delta= 4 + 60
Delta= 64

X= -b +ou- √delta / 2a
X'= -(-2) - √64 / 2.1
X'= 2 - 8 / 2
X'= -3

x"= -(-2) + 8 / 2
X"= 5