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Simplifying
7x2 + -16 + 4 = 0
Reorder the terms:
-16 + 4 + 7x2 = 0
Combine like terms: -16 + 4 = -12
-12 + 7x2 = 0
Solving
-12 + 7x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '12' to each side of the equation.
-12 + 12 + 7x2 = 0 + 12
Combine like terms: -12 + 12 = 0
0 + 7x2 = 0 + 12
7x2 = 0 + 12
Combine like terms: 0 + 12 = 12
7x2 = 12
Divide each side by '7'.
x2 = 1.714285714
Simplifying
x2 = 1.714285714
Take the square root of each side:
x = {-1.309307341, 1.309307341}
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