k = 5, r = -1
k = 5, r = 2
k = 2, r = -5
k = -1, r = 5
Correct answer is B
x2+4x+k=(x+r)2+1
x2+4x+k=x2+2rx+r2+1
Comparing the LHS and RHS equations, we have
2r=4⟹r=2
k=r2+1=22+1=5
Evaluate log10(13+14)+2log102+log10(37)...
A line passes through the origin and the point (114,212). Find the y-coordina...
If 5√2−√88=m√2, where m is a constant. Find m....
Find the coefficient of x3 in the binomial expansion of (3x+4)4 in ascending powers of x...
Evaluate tan 75o; leaving the answer in surd form (radicals) ...
Find the coefficient of x3y2 in the binomial expansion of (x-2y)5...
Find the variance of 1, 2, 0, -3, 5, -2, 4....
The lines 2y+3x−16=0 and 7y−2x−6=0 intersect at point P. Find the coordinates of...
Find the equation of the normal to the curve y = 3x2+2 at point (1, 5)...