Question

If p , q , and r are real and p ≠ q , then show that the roots of the equation :
(p - q)x² + 5(p -q)x - 2( p - q) = 0 , are real and unequal .

Answer 1

take p-q as y
find d
u get 25y²-8y²=17 y²
thats surely positive
hence proved