Answered

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I think of a number.
If I subtract 10 from my number, then square the result,
I get the same answer as
if I square my number, then subtract 10 from the result.
What is my number?
You must show an algebraic method (use letter x in your working).
+
Answer:

Sagot :

itt is d because

dat is not the wrong anser lol

clarkmar003

Answer:

x =5.5

Step-by-step explanation:

The directions say to use x for the number.

"take 10 away from"

x - 10

"then square the result"

(x - 10)^2

"I get the same answer" means the two expressions will be equal to each other.

"if I square my number"

x^2

"then subtract 10 from the result"

x^2 - 10

SET EQUAL TO EACH OTHER.

(x - 10)^2 = x^2 -10

Multiply on the left side.

x^2-20x+100 =x^2-10

subtract x^2 from both sides.

-20x + 100 = -10

subtract 100.

-20x = -110

divide by -20

x = 11/2 or 5.5

CHECK:

(5.5-10)^2=20.25

5.5^2 - 10=20.25

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