Question

find a3+b3 if a+b=3 and ab=2​

Answer 1

$\star\:\:\bf\large\underline\blue{Given:-}$

• $a+b=3$
• $ab=2$

$\star\:\:\bf\large\underline\blue{To\: find:-}$

• $a^{3}+b^{3}$

$\star\:\:\bf\large\underline\blue{Solution:-}$

$a + b = 3$

$ab = 2$

$\bf\underline\blue{Now,}$

${a}^{3} + {b}^{3} = {(a + b)}^{3} - 3ab(a + b)$

$= {3}^{3} - 3 \times 2 \times 3$

$= 27 - 18$

$= 9$

$\star\:\:\bf\large\underline\blue{Answer:-}$

• ${a}^{3} + {b}^{3} = 9$

Answer 2

Step-by-step explanation:

a3 + b3 = ( a+ b)3 -3ab( a+ b )

so (3)3- 3 ×2×3 = 9

mark as brilist answer