The two square roots of 18 are: 4.242641 and -4.242641
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The two square roots are +70 and -70 .
+6 and -6 are the square roots of 36.
You're going to want to multiply the square root of 2 by itself to get rid of it. Then you're left with x times 2 equals 18. a = 9√2
They are 9.433981 and -9.433981
+12 and -12