Question

Use the quadratic formula to solve 2y2 – 10y + 8 = 0.

A.
{–4, –1}

B.
{4, –1}

C.
{–4, 1}

D.
{4, 1}

Answer 1

\[x = \frac{ 10 \pm \sqrt{100 - 4(2)(8)} }{ 4}\]
\[x = \frac{ 10 \pm \sqrt{36} }{ 4 }\]
\[x = \frac{ 10 - 6 }{ 4 } x = \frac{ 10 + 6 }{ 4 }\]
\[x =\frac{ 4 }{ 4 } or x = \frac{ 16 }{ 4 }\]
so x = 4 and x = 1

Answer 2

Use the quadratic formula to solve 2y2 + 3y = 2.

A.
{–½, 2}

B.
{–½, –2}

C.
{½, 2}

D.
{½, –2}

Answer 3

\[x = \frac{ -3 \pm \sqrt{9 - 4(2)(-2)} }{ 4 }\]

Answer 4

\[x = \frac{ -3 \pm \sqrt{9 + 16} }{ 4}\]

Answer 5

\[x = \frac{ -3 \pm \sqrt{25}}{ 4}\]
\[x = \frac{ -3 + 5 }{ 4 } or x = \frac{ -3 - 5 }{4 }\]
\[x = \frac{ 2 }{ 4 } or x = \frac{ -8 }{ 4 }\]

Answer 6

given that, x = 1/2 and x = -2

Answer 7

Use the quadratic formula to solve x2 + 7x + 8 = 0. Estimate irrational solutions to the nearest tenth.

A.
{–12, 5}

B.
{–11.1, –2.9}

C.
{–5.6, –1.4}

D.
{–3.9, 12.1}

Answer 8

just plug in the values to the formula, I've already done wrong by not properly explaining what I did