Do you mean the following?
x2 = 4 - 7x
If so, then:
x2 + 7x = 4
x2 + 7x + 49/4 = 4 + 49/4
(x + 7/2)2 = 65/4
x + 7/2 = ±√65 / 2
x = (-7 ± √65) / 2
So x is equal to (-7 - √65) / 2 and (-7 + √65) / 2
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(x + 11)(x - 4)
49/4 or 12.25
I'll show work. X2-8x-4=0. X2-8x=4. X-8x=2. -7x=2. X=-(2/7).
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As I cannot see the marks in between, I will do it for all possibilities.x^2+7x+12:(x+4)(x+3)_________________________________________________________________x^2-7x+12:(x-4)(x-3)The other two possibilities do not have real values, so I have excluded them.