Multiply the radical to make a radical 18. turn the radical 18 into radical 9 and 2. the radical 9 would equal 3. 4x3radical 2. or 12 radical 2
Okay so basically, you subtract 18 on both sides since the 18 doesn't work, making the equation
<span>x</span>²<span> - 10x = -18
So then you add (b/2)</span>²<span>, which is 25, to both sides, to get
</span><span>x</span>²<span> - 10x + 25 = 7
</span><span>After this, you factor.
</span><span>(x-5)(x-5) = 7
</span><span>Then you simplify.
(x-5)</span>²<span> = 7
Then you solve for x.
</span>√(<span>x-5)</span>²<span> = </span>√7
x-5 = (+ or -)√7
~ x= 5 (+ or -)√7 ~
Hope this helps!
You can always treat such examples as an equation;
(90+96+86+92+X)/5=90
X is the desired score, 5 is the number of tests. As you can see, it is the usual equation for getting the mean value which the sum of the values over their number.
now; 90+96+86+92+X=90*5
X=90*5-(90+96+86+92)
X=86.
Hope this helps.