Q19 and Q20, solve radical equestions

more resources:

blackpenredpen
straightforward math lessons,

tags: interval notations, how to solve inequalities, how to graph inequalities, how to write interval notations, understand interval notation, switch the inequality when we multiply or divide by a negative number, blackpenredpen algebra lesson, jordan 1s bred, jordan 1s banned,

[janiswehen]

doesnt the first one has a selution. x=6, 5

(6.5*4-1)^(0.5)=-5

because the root of a is +/- a^(0.5).

[pednikz]

Isn't 6.5 a solution to the first one? 6.5*4=26>26-1=25>sqrt of 25=-5?

Right because the sqaure root can be positive or negative.