2 years ago

Need help am being timed pls

Mathematics

1 answer:

goldenfox [79]2 years ago

6 0

What are the answer options?

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What is (2x-7y)^2 simplified

worty [1.4K]

Answer:

4x² - 28xy + 49y²

Step-by-step explanation:

(2x - 7y)²

= (2x - 7yy)(2x - 7y)

Each term in the second factor is multiplied by each term in the first factor, that is

2x(2x - 7y) - 7y(2x - 7y) ← distribute parenthesis

= 4x² - 14xy - 14xy + 49y² ← collect like terms

= 4x² - 28xy + 49y²

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3 years ago

Suppose x and y are nonzero vectors in an inner product space. Show that x and y are orthogonal if and only if ||x+y|| = ||x-y||

harkovskaia [24]

Answer:

Step-by-step explanation:

Suppose x and y are nonzero vectors in an inner product space.

Let us assume that x and y are orthogonal

i.e. innter product is 0.

This implies dot product of x and y is 0

Then x.y =0

i.e. $x^2+y^2 +2x.y = x^2+y^2-2x.y\\||x+y||=||x-y||$

Proved

Converse part:

Let $||x+y||=||x-y||$

Square also would be equal

$||x+y||^2=||x-y||^2\\||x||^2+||y||^2+2x,t=||x||^2+||y||^2-2x.y\\x.y =0$

Hence inner product of x and y is 0

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3 years ago

F(-3) = 2x^2 + 2 - how do i solve

irakobra [83]

Answer:

Step-by-step explanation:

$f(x)=2x^{2} +2\\f(-3)=2(-3)^{2} +2\\f(-3)=2(9)+2 = 18 + 2 = 20$

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3 years ago

Find A+B, A, B, C, or D.

klio [65]

Answer: the answr is b because its divisble

Step-by-step explanation:

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3 years ago

the profits from eds plumbing company increased by 14,460, or 30% this year. what profit did the company esrn last year?

mart [117]

The company earned a profit of $48,200 last year.

~ hope this helps!

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3 years ago