Question

Find the value of : l+m if l-m=3 , lm=7

Answer 1

Answer:

Step-by-step explanation:

l-m=3 --1

lm=7--2

From 1: l=3+m

If substituted: (m+3)m=7

m^2+3m-7=0

The question doesn't form a proper linear equation for each other

Answer 2

Answer:

$answer = \sqrt{37} \\ (a + b) { }^{2} = (a - b) {}^{2} + 4ab \\ (a + b) {}^{2} = 3 {}^{2} + 4 \times 7 \\ = 9 + 28 \\ (a + b) {}^{2} = 37 \\ a + b = \sqrt{37}$