Let's say you have
$0.5\times 1.5 \ x^2 - (0.5\times 3.2 \times 1.5) = 23 $
or something similar. Is there an easy way to just get $x^2$ in one step?
Let's say you have
$0.5\times 1.5 \ x^2 - (0.5\times 3.2 \times 1.5) = 23 $
or something similar. Is there an easy way to just get $x^2$ in one step?
If $a \times x^2 - b = c$ then $x^2 = {c+b\over a}$ There is really no easier way to find $x^2$ than just computing the value of this expression. In your case, $a = 0.5\times 1.5=0.75$, $b=0.5\times 3.2\times 1.5=2.4$, and $c=23$.
Sometimes you can save time by cancelling common factors first, but that is not the case here, since $c=23$ has no nice factor in common with $b$.
By the way, you are using both decimal commas and decimal points. It's better not to mix different notations.
One moves expressions around in his head. Performing mental gymnastics, we have $x^2=\frac{23+0.5\times 3.2\times 1.5}{0.5\times 1.5}$.