Question

if a+b =15 , ab=36 find a^3+b^3​

Answer 1

(a+b)³ = 15³

=> a³+ b³ + 3ab (a+b) = 3375

=> a³+ b³ + (3 x 36)(15) = 3375

=> a³ + b³ + 1620 = 3375

=> a³+ b³ = 3375 -1260

=> a³+ b3 = 2115

Answer 2

Answer:

1755

Step-by-step explanation:

(a+b)^3 = a^3+b^3 +3ab(a+b)

(15)^3 = a^3 +b^3 +3ab(a+b)

3375 = a^3 +b^3 + 3*36(15)

3375 = a^3 +b^3 + 108*15

a^3 +b^3 = 3375 - 1620

a^3 +b^3 = 1755

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