Question

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Answer 1

factor out the left side

(x)(x+10) = 18
^
even this out between the 2

(x+5)(x+5) = 18 ; since n*n=n^2 rewrite

(x+5)^2 = 18 ; undo the square with a sqrt

x+5 = +- sqrt(18) ; and get rid of the +5

x = -5 +- sqrt(18)

Answer 2

i think i forgot a smidge in that; we need to account for the 5^2 that we introduce on the left; so add it to the right

Answer 3

(x+5)(x+5) = 18 + 25

(x+5)^2 = 43

x = -5 +- sqrt(43)

thats better