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algol13
3 years ago
6

Patel is solving 8x2 + 16x + 3 = 0. Which steps could he use to solve the quadratic equation? Select three options.

Mathematics
2 answers:
MakcuM [25]3 years ago
7 0

Answer:

<em>8(x2 + 2x) = –3 </em>

<em>8(x2 + 2x + 1) = –3 + 8 </em>

<em>x = –1 Plus or minus StartRoot StartFraction 5 Over 8 EndFraction EndRoot</em>

Step-by-step explanation:

<u>Solving Quadratic Equations </u>

Sometimes it's preferred to solve quadratic equations without the use of the known quadratic formula solver. One of the most-used methods consists of completing squares and solving for x.

We have the equation

\displaystyle 8x^2+16x+3=0

We separate variables from constants

\displaystyle 8x^2+16x=-3

Taking the common factor  8

\displaystyle 8(x^2+2x)=-3

Completing squares in the brackets and balancing the equation in the right side

\displaystyle 8(x^2+2x+1)=-3+8

Factoring the perfect square

\displaystyle 8(x+1)^2=5

Isolating x

\displaystyle (x+1)^2=\frac{5}{8}

\displaystyle (x+1)=\pm \sqrt{\frac{5}{8}}

\displaystyle x=-1\pm \sqrt{\frac{5}{8}}

We can clearly see the steps used to solve the quadratic equation are (in order and written like in the question)

8(x2 + 2x) = –3

8(x2 + 2x + 1) = –3 + 8

x = –1 Plus or minus StartRoot StartFraction 5 Over 8 EndFraction EndRoot

marshall27 [118]3 years ago
3 0

Answer:

A B D

Step-by-step explanation:

I got a 100 on edge

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