2 years ago

Solve for x. x2 = 16

Mathematics

1 answer:

Rufina [12.5K]2 years ago

7 0

Answer:8

Step-by-step explanation:

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Write the phrase as an expression. 5 less than 8 An expression is

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Answer:

5<8

Step-by-step explanation:

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3 years ago

Find the discriminant, and determine the number of real solutions. then solve x^2 +8x+20=0

vodomira [7]

Answer:

Part 1) The quadratic equation has zero real solutions

Part 2) The solutions are

$x_1=-4+2i$ and $x_2=-4-2i$

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2}+8x+20=0$

$a=1\\b=8\\c=20$

The discriminant is equal to

$D=(b^{2}-4ac)$

If D=0 -----> the quadratic equation has only one real solution

If D>0 -----> the quadratic equation has two real solutions

If D<0 -----> the quadratic equation has two complex solutions

<em>Find the value of D</em>

$D=8^{2}-4(1)(20)=-16$ -----> the quadratic equation has two complex solutions

<em>Find out the solutions</em>

substitute the values of a,b and c in the formula

$x=\frac{-8(+/-)\sqrt{8^{2}-4(1)(20)}} {2(1)}$

$x=\frac{-8(+/-)\sqrt{-16}} {2}$

Remember that

$i=\sqrt{-1}$

$x=\frac{-8(+/-)4i} {2}$

$x_1=\frac{-8(+)4i} {2}=-4+2i$

$x_2=\frac{-8(-)4i} {2}=-4-2i$

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3 years ago

Two times the sum of a number and 7

GenaCL600 [577]

Answer:

2(x+7)

Step-by-step explanation:

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Answer:

statement B and C are true...hope this helps:)

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A computer store buys a computer system at a cost of $370.80. Then selling price was first at $618, but then the store advertise

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Answer:

The answer is 494.40$

Step-by-step explanation:

618*80=49440

49440/100=494.40

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2 years ago