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## Answers

The Brainliest Answer!

**the general formula is**

**a^3+-b^3=(a+-b)(a^2-+ab+b^2)**

**in our case will be**

**a^3+b^3=(a+b)(a^2-ab+b^2)**

till now we know only

**a+b=10 and ab=21**

So we have

10(a^2+b^2-21)=

We need to find out a^2+b^2

but a+b=10 /()^2=

a^2+2ab+b^2=100

a^2+2*21+b^2=100

a^2+b^2=100-42

**a^2+b^2=58**

so

10(58-21)=

10*37=370

so

10(58-21)=

10*37=370