How do I solve for two unknown questions in binomial expansion?

[@glitchpoint5]

You're a life saver Mr Huang.🤣

[@humphreybanda3146]

Impressive teaching sir❤

[@LawrenceNdelemani-k6z]

Well explained thank you very much

[@kelvinkalasa7045]

Very much greatful, thank you alot

[@mapeallan.w9390]

If only I've seen this video before...I would have flat my Math test.
Anyway impressive performance Good sir.. well done 💯👏🏻👑

[@piptip694]

Tysmm really helpful

[@hamydahamster2858]

you saved me