Question

Solve.

x2 + 8x – 8 = 0

A.
05_14_UT_4a.gif

B.
05_14_UT_4c.gif

C.
05_14_UT_4b.gif

D.
05_14_UT_4d.gif

Answer 1

sorry

Answer 2

Whatever your answer choices are... do you prefer quadratic formula or completing the square ?

Answer 3

quadratic formula

Answer 4

Yes, so

\(\LARGE\color{blue}{\bf x=~ \frac{-b±\sqrt{b^{2}-4(a)(c)}}{2(a)} }\)
can you plug in numbers ?

Answer 5

\(\LARGE\color{blue}{ \bf \frac{-(8)±\sqrt{(8)^{2}-4(1)(-8)} }{2(1)} }\)

\(\LARGE\color{blue}{ \bf \frac{-(8)±\sqrt{64-(-32)} }{2} }\)

\(\LARGE\color{blue}{ \bf \frac{-8±\sqrt{96} }{2} }\)

\(\LARGE\color{blue}{ \bf \frac{-8±\sqrt{16 \times 6} }{2} }\)

\(\LARGE\color{blue}{ \bf \frac{-8±4\sqrt{ 6} }{2} }\)

\(\LARGE\color{blue}{ \bf -4±2\sqrt{ 6} }\)