Answer:
x^2 -81
Step-by-step explanation:
(x+9)(x-9)
FOIL
first x*x = x^2
outer -9x
inner 9x
last -9*9 = -81
Add them together
x^2 -9x+9x -81
Combine like terms
x^2 -81
Answer: 
Step-by-step explanation:
Use the pythagorean theorem 
plug in and solve



if you need to solve for the sides
3x = 3(4.7434) = 14.2302
X = 42 (i’m not sure your giving enough information)
Y4 - y3 + 2y2 + y - 1 over (y + 1) • (y2 - y + 1)
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Answer:
the answer is incorrect though the first step is correct but the second step is wrong and so is the answer. the correct answer would be x raise to the power of 2by 5
Step-by-step explanation:
{x⁶/⁵⁻²/⁵} ¹/²= {x⁴/⁵}¹/²= x²/⁵
in the second step the power of the denominator must be subtracted from the power of the numerator using the law of indices then we would get the correct answer