Question

If a + b = 9 and ab = 20, then find the value of (a+b)^3​

Answer 1

Answer:

if a+b=9, a*b=20, then, a=4, b=5, (a+b)³= 8000

Answer 2

${(a + b)}^{3} = (a + b)(a + b)(a + b)= > {(a + b)}^{3} = 9 \times 9 \times 9 = {9}^{3} \\ = > {(a + b)}^{3} = 729$

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