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mars1129 [50]
3 years ago
5

Step by step Please urgent

Mathematics
1 answer:
kotegsom [21]3 years ago
6 0

Answer:

Below in bold.

Step-by-step explanation:

1) ( a^2 + b^2 = (a + b)^2 - 2ab

= 29 - 2(6)

= 29-12

= 17.

2).  (x - y)^2 = x^2 + y^2 - 2xy

so 20 = 18 - 2xy

2xy = 18-20 = -2

xy = -1.

3). 1/x + x = 7

(1/ x + x)^2 = 1/x^2  + x^2 +x/x + x/x

= 1/x^2 + x^2 + 2

But(1/x + x)^2 = 7^2 = 49

so 1/x^2 + x^2 + 2 = 49

so 1/x^2 + x^2 = 49 - 2 = 47.

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1. Find the value of x in the equation √ x + 5 = √ x + 45.<br> A. 16<br> B. 4<br> C. 1<br> D. 2
Korvikt [17]
I think you mean
sqrt x + 5 = sqrt (x+45)


if you plug in x = 4,
left side = sqrt 4 + 5 = 2+ 5 = 7

right side = sqrt (4+45) = sqrt 49 = 7

so the answer is x = 4 :)
7 0
3 years ago
Read 2 more answers
Please help with this I still do not know what I am doing
amm1812

Answer:

See Below

Step-by-step explanation:

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