Question 86039
1. X^2=12, X=SQRT12, X=3.463
2. X^2-80=0, X^2=80, X=SQRT80, X=8.944
3. X^2+5=21, X^2=21-5, X^2=16, X=SQRT16, X=4
4. 9X^2=14, X^2=14/9, X=SQRT14/9, X=SQRT1.5566, X=1.247
5. (X-4)^2=3, X^2-8X+16=3, X^2-8X+16-3=0, X^2-8X+13 USING THE QUADRATIC EQUATION
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} WE GET:
X=(8+-SQRT[-8^2-4*1*13])/2*1
X=(8+-SQRT[64-52})/2
X=(8+-SQRT12)/2
X=(8+-3.464)/2
X=(8+3.464)/2
X=11.464/2
X=5.732 ANSWER.
X=(8-3.464)/2
X=4.536/2
X=2.268 ANSWER.
I'LL LEAVE THE REST FOR YOU TO SOLVE.