hi, guys, i can't figure out the answer to this question. "Work out the value of (√2+√8)^2." I tried expanding.. didn't work. how on earth do I get the right answer... am I going about it wrong, do I need to simplify? what should I do?
hi, guys, i can't figure out the answer to this question. "Work out the value of (√2+√8)^2." I tried expanding.. didn't work. how on earth do I get the right answer... am I going about it wrong, do I need to simplify? what should I do?
Have you tried simplifying the bracket? root 8 = ?
answer would be 18.. root 2 x root 2 = 2 root 2 x root 8 = root 16 (which equals 4... and then 4 x 2 since you have root 16 twice) root 8 x root 8 = 8 2+(4x2)+8 = 18
hi, guys, i can't figure out the answer to this question. "Work out the value of (√2+√8)^2." I tried expanding.. didn't work. how on earth do I get the right answer... am I going about it wrong, do I need to simplify? what should I do?
(√2+√8)^2 can also be written as (√2+√8)(√2+√8) so when you multiply out the brackets √2 will be multipled by √8 and √2 and the same goes for √8. You should know when 2 surds -that are the same- are multiplied it becomes a full number. So √8 multiplied by itself will give you 8 same goes for the √2, it becomes 2. Now you are left with √2*√8 and another √2*√8 they both will give seprate answers of √16 and root of 16 is 4. Now you are left with 2+4+4+8