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joseroblesrivera123
30.05.2020 •
Mathematics
Someone do this plz.............
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Ответ:
11 ) x^3 - x^2 + 6x + 7,
12 ) 3x^3 + 7x^2 - 1,
13 ) 2x^2 + 13xy - 4y^2,
14 ) - x^4 + 4x^3 - 3x,
15 ) - 5x^2 - 7xy + 6y^2,
16 ) x^2y + 5xy^2,
17 ) x = 324,
18 ) 8 / 11,
19 ) Length of missing side is 20 meters
Step-by-step explanation:
11 ) ( x^3 + 2x^2 + 5x ) - ( 3x^2 - x - 7 ) ⇒ Remove the ( ) through distribution,
x^3 + 2x^2 + 5x - 3x^2 + x + 7 ⇒ Group like terms,
Solution; x^3 - x^2 + 6x + 7
12 ) ( x^4 + 8x^2 - 1 ) - ( x^2 - 3x^3 + x^4 ) ⇒ Remove the ( ) through distribution,
x^4 + 8x^2 - 1 - x^2 + 3x^3 - 7x^4 ⇒ Group like terms,
Solution; 3x^3 + 7x^2 - 1
13 ) ( 3x^2 + 7xy - 2y^2 ) - ( x^2 - 6xy + 2y^2 ) ⇒ Remove the ( ) through distribution,
3x^2 + 7xy - 2y^2 - x^2 + 6xy - 2y^2 ⇒ Group like terms,
Solution; 2x^2 + 13xy - 4y^2
14 ) ( 5x^4 - 2x^2 ) - ( 3x - 2x^2 - 4x^3 + 6x^4 ) ⇒ Remove the ( ) through distribution,
5x^4 - 2x^2 - 3x + 2x^2 + 4x^3 - 6x^4 ⇒ Group like terms,
Solution; - x^4 + 4x^3 - 3x
15 ) ( -x^2 - 9xy + 5y^2 ) - ( 4x^2 - 2xy - y^2 ) ⇒ Remove the ( ) through distribution,
- x^2 - 9xy + 5y^2 - 4x^2 + 2xy + y^2 ⇒ Group like terms,
Solution; - 5x^2 - 7xy + 6y^2
16 ) ( 4x^2y - 3xy^2 ) - ( 3x^2y - 8xy^2 ) ⇒ Remove the ( ) through distribution,
4x^2y - 3xy^2 - 3x^2y + 8xy^2 ⇒ Group like terms,
Solution; x^2y + 5xy^2
17 ) √x = 18 ⇒ Square either side,
( √x )^2 = ( 18 )^2 ⇒ Simplify,
Solution; x = 324
18 ) 3 √( 512/ 1331 ) ⇒ Take cube root of 512, and 1331,
3 √ 512 = 8, and 3 √ 1331 = 11, ⇒ Substitute,
Solution; 8 / 11
19 ) Apply Pythagorean Theorem, as such;
a^2 + b^2 = c^2,
15^2 + b^2 = 25^2,
225 + b^2 = 625,
b^2 = 400,
Solution; Length of missing side is 20 meters
Ответ:
i think it mit be ab or c