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zakładam że masz do obliczenia x...
2x + 20 +2x - 4 = 2x
2x + 2x - 2x = -20 + 4
2x = -16|:2
x = -8
2(x + 10)+ 2(x - 2) = x²
Obliczenia:
2(x + 10)+ 2(x - 2) = x²
2x + 20 + 2x - 4 = x²
4x +16=√ x²
√(4x + 16)= x
2x + 4= x I -2x
4 = -x I : (-1)
-4=x