Question

2x²-5x-16=-5x????????

Answer 1

Olá Fabi

2x² - 5x - 16 = -5x

2x² - 16 = 0

x² = 8

x1 = 2√2
x2 = -2√2

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Answer 2

$2 x^{2} -5x-16=-5x \\ 2 x^{2} -5x+5x=16 \\ 2 x^{2} +0x=16 \\ 2 x^{2}=16 \\ x^{2} =16/2 \\ x^{2} =8 \\ x=+- \sqrt{8} \\x=+- \sqrt{4*2} \\ x=+- 2\sqrt{2} \\ x=2 \sqrt{2} \\ x=-2 \sqrt{2}$