Question 1094450
A) 4x^2 – 27 = 0
Square root property;
{{{4x^2=27}}}
{{{x^2=27/4}}}

 {{{x=0+- (3/2)sqrt(3)}}}



B) 4x^2 – 8x – 5 = 0
C) 4x^2 – 8x – 12 = 0
D) 4x^2 – 9x – 7 = 0
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Try to factorize if you have the patience or can quickly see; otherwise, quadratic formula.




You might want to try completing the square for B and C.
{{{4x^2-8x=5}}}
{{{4(x^2-2x)=5}}}
{{{4(x^2-2x+1-1)=5}}}
{{{4((x-1)^2-1)=5}}}
{{{4(x-1)^2-4=5}}}
{{{4(x-1)^2=9}}}
{{{(x-1)^2=9/4}}}
{{{x-1=0+- 3/2}}}
{{{x=1+- 3/2}}}