2 years ago

Explain square roots

1 answer:

5 0

In mathematics, a square root of a number x is a number y such that y2 = x; in other words, a number y whose square (the result of multiplying the number by itself, or y ⋅ y) is x. For example, 4 and −4 are square roots of 16 because 42 = (−4)2 = 16.

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Help please! 6x^2+2x-9=0 A 6.4, -8.4 B 1.1, -1.4 C -2.2, 2.8 D -1.1, -1.4

Yakvenalex [24]

$6x^2+2x-9=0\\\\a=6;\ b=2;\ c=-9\\\\\Delta=b^2-4ac\to\Delta=2^2-4\cdot6\cdot(-9)=220\\\\x_1=\dfrac{-b-\sqrt\Delta}{2a};\ x_2=\dfrac{-b+\sqrt\Delta}{2a}\\\\x_1=\dfrac{-2-\sqrt{220}}{2\cdot6}=\dfrac{-2-\sqrt{220}}{12}\approx-1.4\\\\x_2=\dfrac{-2+\sqrt{220}}{2\cdot6}=\dfrac{-2+\sqrt{220}}{12}\approx1.1$

Answer: B. 1.1; -1.4.

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3 years ago

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s2008m [1.1K]

Answer:

$2x + 6x + 8 = 32$

collect like terms

$8x + 8 = 32$

move the constant to the right hand side and change its sign.

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3 years ago

I am needing help with this question!!

Leni [432]

The answer is C. y = - 2x - 1

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2 years ago

3 1 8 5 7 2 1 6 find the mode

Genrish500 [490]

Answer:

Step-by-step explanation:

Mode is 1 as 1 has repeated the most number of times

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3 years ago

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VLD [36.1K]

Step-by-step explanation:

$required \: scale \\ = \frac{12 \frac{1}{2} }{1 \frac{9}{16} } \\ \\ = \frac{ \frac{25}{2} }{ \frac{25}{16} } = \frac{25}{2} \times \frac{16}{25} = \frac{1}{2} \times \frac{16}{1} \\ \\ = 8 \: : \: 1$

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3 years ago