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x² + 2x = 4
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PEMBAHASAN

${x}^{2} + 2x = 4 \ = {x}^{2} + 2x - 4 = 0 \ x = frac{ - 2 : + : sqrt{ {2}^{2} - 4 times 1 times ( - 4) } }{2 times 1} \ x = frac{ - 2 : + : sqrt{ {2}^{2} - 4 times ( - 4) } }{2} \ x = frac{ - 2 : + : sqrt{4 - 4 times ( - 4)} }{2} \ x = frac{ - 2 + sqrt{4 + 16} }{2} \ x = frac{ - 2 : + : sqrt{20} }{2} \ x = frac{ - 2 : + : 2 sqrt{5} }{2} \ x = frac{ - 2 - 2 sqrt{5} }{2} \ x = - 1 + sqrt{5} \ x = frac{ - 2 - 2 sqrt{5} }{2} \ x = - 1 + sqrt{5} \ x = - 1 - sqrt{5} \ x1 = - 1 - sqrt{5} : .x : 2 = - 1 + sqrt{5}$

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