root under root 30+ root 21/ root 30 - root 21
Answers
Answered by
2
Answer:
(√30+√21) ÷ (3)
Step-by-step explanation:
√ {( √30+√21) ÷ (√30-√21) }
multiply and divide by (√30+√21)
= √[ { (√30+√21)(√30+√21) } ÷ { (√30-√21)(√30+√21) } ]
= √ [ { (√30+√21)² } ÷ { (√30)² - (√20)² } ]
= √ { (√30+√21)² ÷ (30-21) }
= √ { (√30+√21)² ÷ (9) }
= √ { (√30+√21)² ÷ (3)² }
= √ { (√30+√21) ÷ 3 } ²
= (√30+√21) ÷ (3)
Similar questions