Math, asked by meera14, 1 year ago

if a-b=7 and ab= 18; find a+b

Answers

Answered by mohansrinivas15mohan
37
here ur answer . we get two values dont worry about that 
Attachments:

meera14: thanks
mohansrinivas15mohan: welcome
Lovemyfrnds: i think we can directly use formula
mohansrinivas15mohan: yes but in exams or any other places we need to do it long for undestanding
149209: i did not understood
Answered by mysticd
121

Answer:

a+b =±11

Step-by-step explanation:

Given a-b=7 ---(1)

ab = 18---(2)

/* We know that

\boxed {(a+b)^{2}=(a-b)^{2}+4ab} */

Now,

\implies (a+b)^{2}=7^{2}+4\times 18\\=49+72\\=121

\implies a+b=±\sqrt{121}\\=±11

Therefore,.

a+b = ±11

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