Question

Show that the function f(x) = x + 7x - 9 has atleast two real roots.​

Answer 1

Answer:

$givn \: equation \: \\ x {}^{2} + 7x - 9 \\ d = b {}^{2} - 4ac \\ d = 7 {}^{2} - 4 \times 1 \times ( - 9) \\ d = 49 + 36 \\ d = 85$

since discriminant is greater than zero the equation has real roots

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