How do you simplify #sqrt5-4sqrt20#?
1 Answer
Oct 5, 2017
Explanation:
#"using the "color(blue)"law of radicals"#
#•color(white)(x)sqrtaxxsqrtbhArrsqrt(ab)#
#rArrsqrt5-4(sqrt(4xx5))#
#=sqrt5-4(sqrt4xxsqrt5)#
#=sqrt5-4(2sqrt5)#
#=sqrt5-8sqrt5larrcolor(blue)" collect like radicals"#
#=-7sqrt5#
