x²-99 factorise and tell correct answer
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Answer:
Roots are 9.949 and -9.949.
Step-by-step explanation:
x² - 99
Quadratic formula :
[-b ± √(b² - 4ac)]/2a
=> (-0 ± √[0² - 4(1)(-99)]) ÷ 2(1)
=> (-0 ± √[0 - (-396)]) ÷ 2
=> (-0 ± √[0 + 396]) ÷ 2 (Minus and minus combine to become plus)
=> (-0 ± √[396]) ÷ 2
=> (-0 ± 19.898) ÷ 2
=> (-0 + 19.898) ÷ 2 AND (-0 - 19.899) ÷ 2
=> (19.898) ÷ 2 AND (-19.899) ÷ 2
=> 9.949 AND -9.949
∴ Roots are x = 9.949 and -9.949.
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