Math, asked by taqueerizwan2006, 2 months ago

\large\huge\ { \fcolorbox{blue}{aqua}{\red{If a²+b² = 21 ,  ab = 2  then  find  a+b}}}​​

Answers

Answered by prabhas24480
1

\huge \fbox \purple{❥ Answer}

a²-b²=21

a²+b²=29

a²+b²+a²-b²=21+29

2a²=50

a²=25

a=√25

a=±5

a²-b²=21

25-b²=21

b²=4

b=±5

a²+b²=(a+b)²-2ab

29=±7²-2ab

29=49-2ab

ab=10

so,ab =10

hope helped

Answered by nikhilboddupally992
1

Step-by-step explanation:answer=5

Given

 {a }^{2}  +  {b}^{2}  = 21

ab = 2

{(a + b)}^{2}  =  {a}^{2}  +  {b}^{2}  + 2ab \\   \:  \:  \:  \:  \:  \:  \:  \: = 21 + 2(2)  \\ = 25 \\ a + b =  \sqrt{25}

therefore a+b=5

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