Question

I'm in 11th standard.because of new syllabus. I can't understand the solution of this question.so help me.
And simplify it.​

Answer 1

I study in eighth standard and I think the answer is

1.)√-16+3√-25+√-36-√-625

=-4+(3×-5)+(-6)-(-25)

-4+(-15)+(-6)+25

=-25+25

=0

2.)(4×-2)+(5×-3)-(3×-4)

=-8+-15+12

= -11

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