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adoni [48]
3 years ago
10

9th grade math please help its urgenttt

Mathematics
2 answers:
liubo4ka [24]3 years ago
8 0

Answer:

B

Step-by-step explanation:

(see attached for reference)

for a quadratic equation:

ax²+bx+c = 0

The solution given by the quadratic formula is :

x = [ -b ± √(b²-4ac) ] / 2a

comparing this to the given equation

2x² - 5x + 5 = 0

it is clear that a = 2, b = -5 and c = 5,

substituting the values into the quadratic formula:

x = [ -(-5) ± √( (-5)²-4(2)(5) ) ] / 2(2)

x = [ 5 ± √( 25 - 40 ) ] / 4

x = [ 5 ± √( -15 ) ] / 4    

x = [ 5 ± √( (-1)(15) ) ] / 4

x = [ 5 ± √( -1) √(15 ) ] / 4   (recall that √(-1) = i )

x = [ 5 ± i √(15 ) ] / 4   (answer B)

Hope this helps!

vovangra [49]3 years ago
3 0

Answer:

B

Step-by-step explanation:

observe

2x^2-5x+5=0\\x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}\\=\frac{5\pm \sqrt{(-5)^2-4(2)(5)}}{2(2)}\\=\frac{5\pm \sqrt{-15}}{4}\\=\frac{5\pm i\sqrt{15}}{4}

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Elden [556K]

Hello from MrBillDoesMath

Answer:

[email protected] = - sqrt(7)/ 4    

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Discussion:

This problem can be solved by drawing triangles and looking at ratios of sides or by using the trig identity:

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If [email protected] = 3/4 , the

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which is choice B


Thank you,

Mr. B


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