x=3/10
evaluate
y=5x^2-3x+4
y=5(3/10)^2 -3(3/10)-1 (How do you evaluate this part, step by step)
y=71/20 (This is the answer)
Cyberman, please consider the following.
$\displaystyle y=5\left(\frac{3}{10}\right)^2 -3\left(\frac{3}{10}\right)+4$
$\displaystyle y=5\left(\frac{3^2}{10^2}\right) -3\left(\frac{3}{10}\right)+4$
$\displaystyle y=5\left(\frac{9}{100}\right) -3\left(\frac{3}{10}\right)+4$
$\displaystyle y=\frac{5\times 9}{100} -\frac{3\times 3}{10}+4$
$\displaystyle y=\frac{45}{100} -\frac{9}{10}+4$
To finish the problem you must create a common denominator
$\displaystyle y=\frac{45}{100} -\frac{90}{100}-\frac{400}{100}$
$\displaystyle y=\frac{45-90-400}{100} $
Now finish and simplfy.