Question

Find the difference: square root20 - square root80

Answer 1

-2√(5)

Explanation:

√(20) = √(4*5) = √(4)*√(5) = 2*√(5) = 2√(5)

√(80) = √(16*5) = √(16)*√(5) = 4*√(5) = 4√(5)

therefore : √(20) - √(80) = 2√(5) - 4√(5) = (2 - 4) * √(5) = -2√(5)