Question

3
19. Solving equation Vy? +4y-21 +Vy?-y-6=Jby²-5y-39 following roots are obtained
(a) 2, 3, 5/3 (b) 2, 3, -5/3 (c) -2, -3, 5/3 (d) -2, -3, -5/3
c. 11
mootor obtained​

Answer 1

Question

Solving equation

√(y^2+4y-21) + √(y^2-y-6) = √(6y-5y-39)

Answer

(b) 2,3,-5/3

I don't know how 3 is root of above equation

Formula Used : (a+b)^2 = a^2+ b^2+2ab