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4 years ago

Can I please get some help

Mathematics

1 answer:

Anika [276]4 years ago

3 0

Answer:

a. 6.93 b. 5 c. 6.72 d. 3.46

Step-by-step explanation:

a. √4^2- 4(4)(-2)

Evaluate the power

√16-4×4(-2)

Multiply

√16-16(-2) = √16-(-32) = √16+32 Since 2 negatives equal a positive.

Add

√48

Find square root

√48= 6.92820323028-- rounded-- 6.93

b. √1^2-4(1)(-6)

Evaluate the power

√1-4(1)(-6)

Multiply

√1-(-24) = √1+24 Since 2 negatives equal a positive.

Add

√25

Find the square root

√25=5

c. √1^2-4(1)(-11)

Evaluate the power

√1-4(1)(-11)

Multiply

√1-(-44) = √1+44 Since 2 negative equal a positive.

Add

√45

Find the square root

√45= 6.7082039325-- rounded-- 6.72

d. √6^2-4(3)(2)

Evaluate the power

√36-4(3)(2)

Multiply

√36-24

Subtract

√12

Find the square root

√12= 3.46410161514-- rounded-- 3.46

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Why is -a² is always negative (a ≠ 0) and why is (-a)² is always positive?

hjlf

$-a^2=(-1)\cdot a\cdot a$

Regardless of the sign of $a$ , we have $a\cdot a=a^2\ge0$ (never negative). But multiplying by -1 makes it negative.

On the other hand,

$(-a)^2=((-1)\cdot a)^2=(-1)^2\cdot a^2=1\cdot a^2=a^2$

which can never be negative for real $a$ .

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3 years ago

(PHOTO) please help need this done by tomorrow thank you.

faltersainse [42]

Answer: 125

Step-by-step explanation: ∠4 and 55 are supplementary angles. This means that ∠4 and 55 add up to 180. We can use this to solve for ∠4.

180 - 55 = ∠4

125 = ∠4

So, ∠4 is equal to 125 degrees.

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