Question

what is the answer to -3√5+2√5

Answer 1

\(\bf -3\sqrt{5}+2\sqrt{5}\qquad let's \qquad \sqrt{5}={\color{red}{ a}}\qquad thus\\ \quad \\
-3{\color{red}{ a}}+2{\color{red}{ a}}\)

Answer 2

so, subtract that, see what you get

Answer 3

They have the same radicands so just -3 + 2

-3 + 2 = -1

\[-1\sqrt{5}\]

Answer 4

-1√5 is the answer.