X ^2 -5 x -20
Factorise this
Answers
Answer:
Step-by-step explanation:
x² - 5x - 20 = (x² - 2×(5/2)x + 25/4) - 25/4 - 20 = (x - 5/2)² - 105/4 = (x - 5/2 -√105/2)(x - 5/2 + √105/2) = [x - (5 + √105)/2][x - (5 - √105/2)]
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