If p + q = 6 and pq = 4, then what is the value of p3 + q3?
Answer & explanation
Correct answer: option 3
If p + q = 6
pq = 4
p3 + q3 = ?
a3 + b3 = (a + b)3 – 3ab(a + b)
p3 + q3 = (6)3 – 3×4(6)
p3 + q3 = 216 – 72 = 144
If p + q = 6 and pq = 4, then what is the value of p3 + q3?
Correct answer: option 3
If p + q = 6
pq = 4
p3 + q3 = ?
a3 + b3 = (a + b)3 – 3ab(a + b)
p3 + q3 = (6)3 – 3×4(6)
p3 + q3 = 216 – 72 = 144