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Is x = 5 a solution of the equation x^2 – 2x – 15 = 0 ?
YES
Without solving, comment upon the nature of roots of each of the following equation:
6x^2– 13x + 4 = 0
Real and Unequal
The equation 3x^2 – 12x + (n – 5) = 0 has equal roots. Find the value of n.
n = 17
Find x: 2x^2 – 9x + 10 = 0, when : x belongs to W.
x = 2
Solve : x=4±√11, give your answer to one decimal place.
∴x=4+3.317 or x=4-3.317
∴x=7.317 or 0.683
∴x=7.3 or 0.7
One root of the quadratic equation 8x^2 + mx + 15 = 0 is 3/4 . Find the value of m.
m = -26
Find the value of k for which equation 4x^2 + 8x – k = 0 has real roots.
k is > = –4
Round off to two significant figures:
x=3.618 or x=1.382
∴x = 3.6 or x= 1.4
