Question 38943
{{{3x^2-14x+15=0}}}
*[invoke quadratic "x", 3, -14, 15]
.
{{{5x^2-x-2=0}}}
*[invoke quadratic "x", 5, -1, -2]
.
{{{4x^2-12x+9=0}}}
*[invoke quadratic "x", 4, -12, 9]
.
{{{2x^2=128}}}
{{{x^2=64}}}
{{{x=8}}} or {{{x=-8}}}
.
{{{x^2+25=0}}}
{{{x^2=-25}}}
{{{x=5i}}} or {{{-5i}}}
.
{{{x^2=25/36}}}
{{{x=5/6}}} or {{{x=-5/6}}}
.
{{{0=6x^2-24}}}
{{{-6x^2=-24}}
{{{x^2=4}}}
{{{x=2}}} or {{{x=-2}}}
.
{{{2(x+3)^2-4=68}}}
{{{2(x^2+6x+9)-4=68}}}
{{{2x^2+12x+18-4-68}}}
{{{2x^2+12x-54=0}}}
{{{x^2+6x-27=0}}}
{{{x^2+9x-3x-27=0}}}
{{{(x^2+9x)+(-3x-27)=0}}}
{{{x(x+9)-3(x+9)=0}}}
{{{(x-3)(x+9)=0}}}
{{{x=3}}} or {{{x=-9}}}
.
{{{x^2+5x-24=0}}}
{{{x^2+8x-3x-24=0}}}
{{{(x^2+8x)+(-3x-24)=0}}}
{{{x(x+8)-3(x+8)=0}}}
{{{(x-3)(x+8)=0}}}
{{{x=3}}} or {{{x=-8}}}
.
{{{x^2-3x-28=0}}}
{{{(x^2-7x)+(4x-28)=0}}}
{{{x(x-7)+4(x-7)=0}}}
{{{(x+4)(x-7)=0}}}
{{{x=-4}}} or {{{x=7}}}
.
{{{x^2-49=0}}}
{{{x^2=49}}}
{{{x=-7}}} or {{{x=7}}}
.
{{{5x^2-2x-7=0}}}
{{{(5x^2-7x)+(5x-7)=0}}}
{{{x(5x-7)+1(5x-7)=0}}}
{{{(x+1)(5x-7)=0}}}
{{{x=-1}}} or {{{x=7/5}}}
.
I do not know why the next problems are all under the square root sign, but i bet you can do those. Remember, no value that is negative should be under a square root sign when you are not dealing with complex solutions.