Question

if a^1/2×b^1/2+c1/2=0 then find a+b-c

Answer 1

${a}^{ \frac{1}{2} } \times {b}^{ \frac{1}{2} } + {c}^{ \frac{1}{2} } = 0\\ \sqrt{a} \times \sqrt{b} + \sqrt{c} = 0 \\ \sqrt{ab} + \sqrt{c} = 0 \\ \sqrt{ab} = - \sqrt{c} \\ ab = c \\ \\ now \\ a + b - c = a + b - ab$