What is (2x+5)3+(5x-9)3 ?

The solution to (2x+5)3+(5x-9)3 is 21x-12

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simplify (2x+5)3+(5x-9)3

simplify

(2 x + 5) 3 + (5 x - 9) 3

21 x - 12

Solution steps

(2 x + 5) \cdot 3 + (5 x - 9) \cdot 3

= 3 (2 x + 5) + 3 (5 x - 9)

Expand

3 (2 x + 5) : 6 x + 15

= 6 x + 15 + 3 (5 x - 9)

Expand

3 (5 x - 9) : 15 x - 27

= 6 x + 15 + 15 x - 27

Group like terms

= 6 x + 15 x + 15 - 27

Add similar elements:

6 x + 15 x = 21 x

= 21 x + 15 - 27

Subtract the numbers:

15 - 27 = - 12

= 21 x - 12

cos^{2} (- x)

(\frac{1}{4} x + \frac{2}{7} y)^{3}

125 - 8 x^{3} - 27 y^{3} - 90 x y

x^{p} \cdot x^{2} p

\frac{( 30 x ^{2} + 15 x + 10 )}{5}