Question

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

Answer 1

here ur answer . we get two values dont worry about that 

Answer 2

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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