Math, asked by Meghu11, 1 year ago

maths 11 and 14 have to be solved

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Answers

Answered by sandhsujeet

Here is the answer of question no 11

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Meghu11: I didn't understand second the step

Meghu11: please explain to me

sandhsujeet: Which step

Meghu11: second of 1 pic

sandhsujeet: Kha of 1st is equal to the of second

Meghu11: yes

Meghu11: i.e., x square +1 =10 where is 3 gone

Answered by vyaswanth

11)A.

x-1/x=10/3

do cubing on both sides

(x-1/x)³=[10/3]³

x³-1/x³-3x×1/x(x-1/x)=1000/27

x³-1/x³-3(x-1/x)=1000/27

x³-1/x³-3(10/3)=1000/27

x³-1/x³-30/3=1000/27

x³-1/x³-10=1000/27

x³-1/x³=1000/27+10

x³-1/x³=1000+270/27

x³-1/x³=1270/27

THIS IS 11TH ANSWER

14)A.
a-b=7

do cubing on both sides

(a-b)³=(7)³

a³-b³-3ab(a-b)=343

133-3ab(7)=343

-21ab=343-133

-21ab=210

ab= -10
_______

a-b=7

do squaring on both sides

(a-b)²=7²

a²+b²-2ab=49

a²+b²-2×-10=49

a²+b²+20=49

a²+b²=49-20

a²+b²=29
_________

13)A.

the two numbers be X and Y

x+y=11; x³+y³=737

(x+y)³=(11)³

x³+y³+3xy(x+y)=1331

737+3xy(11)=1331

33xy=1331-737

33xy=594

xy=18
____

(x+y)²=(11)²

x²+y²+2xy=121

x²+y²+2×18=121

x²+y²+36=121

x²+y²=121-36

x²+y²=85

sums of square is equal to 85

vyaswanth: ok

vyaswanth: which place and which school

Meghu11: u belong to which place

vyaswanth: Hyderabad,vasanth nagar

Meghu11: I am from unnao and i study in st.judes college

vyaswanth: ok

Meghu11: ok one more question did u want to do it

Meghu11: x=1/4-x ,find the value of i). x+1/x ,ii). xcube+ 1/xcube ,and iii).xpower6+1/xpower 6

Meghu11: and 15 question also plz

Meghu11: please answer this question

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