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Lina20 [59]
3 years ago
8

Which of the following are solutions to the quadratic equation? Check all that

Mathematics
2 answers:
Reil [10]3 years ago
7 0

Answer:

x=-9/10

Step-by-step explanation:

2x+8x+16=7

Step 1: Simplify both sides of the equation.

2x+8x+16=7

(2x+8x)+(16)=7(Combine Like Terms)

10x+16=7

10x+16=7

Step 2: Subtract 16 from both sides.

10x+16−16=7−16

10x=−9

Step 3: Divide both sides by 10.

10x/10

=

−9/10

x=-9/10

Andrew [12]3 years ago
5 0

Answer:

x = - 4 ± \sqrt{7}

Step-by-step explanation:

Given

x² + 8x + 16 = 7 ( subtract 16 from both sides )

x² + 8x = - 9

Using the method of completing the square

add ( half the coefficient of the x- term)² to both sides

x² + 2(4)x + 16 = - 9 + 16

(x + 4)² = 7 ( take the square root of both sides )

x + 4 = ± \sqrt{7} ( subtract 4 from both sides )

x = - 4 ± \sqrt{7}

Then

solutions are x = - 4 - \sqrt{7} , x = - 4 + \sqrt{7}

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