there are 4 different question i dont there answers plz brainly help me to find its answers
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Answer:
x = 1 , 4 , 7
and 1 , 4 ,7 are also in AP
Step-by-step explanation:
x³ - 12x² + 39x - 28 = 0
we can see that x = 1 satisfies the equation
1 - 12 + 39 - 28 = 0
40 - 40 = 0
so x -1 is a factor
(x-1)(x² - 11x + 28) = 0
=> (x-1)(x² - 7x -4x + 28) = 0
=> (x-1)(x(x - 7) -4(x - 7)) = 0
=> (x-1)(x -4)(x - 7) = 0
x = 1 , 4 , 7
and 1 , 4 ,7 are also in AP
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