Answer:
a) Q = 325
b) r = -5 or r = 2
Step-by-step explanation:
a) √Q/√13 = 5
squaring on both sides
(√Q/√13)^2 = 5^2
Q/13 = 25
Q = 25 × 13
Q = 325
b) √10 - 3r = r
(√10 - 3r)^2 = r^2
10 - 3r = r^2
r^2 + 3r - 10 = 0
r^2 + 5r - 2r - 10 = 0
r(r + 5) - 2 (r + 5) = 0
(r + 5) (r - 2) = 0
r = -5 or r = 2
