Question

Ai giúp mình vs ạ

Answer 1

1a. 3x² - 2x(5 + 1,5x) + 10 = 3x² - 10x + 3x² = 6x² - 10x

b. (2x - 3)(x + 7) - 2x(x+5) - x = 2x² - 3x - 3x - 21 - 2x² - 10x = -16x - 21

c. (x + 3)(x - 3) - (x - 5)(x + 2) = x² - 3² - (x² + 2x - 5x - 10) = x² - 9 - x² - 2x + 5x + 10 = 3x + 1

d. (x - 1)2 - (x + 2)(x - 2) = x2 - 2x + 1 - (x2 - 22) = x² - 2x + 1 - x² + 4 = 2x + 5

e. (x + 2)(x² - 2x + 4) - x(x² + 2) = x³ + 2³ - x³ - 2x = 8 - 2x

f. (x + 2y)3 - 6xy(x + 2y) = x³ + 6x²y + 12xy² + 8y - 6x²y + 12xy² = x² + 24xy² + 8y

Answer 2

Bài 3: 

a: \(x^3+x^2-4x-4=\left(x+1\right)\left(x-2\right)\left(x+2\right)\)

b: \(x^2-4x+4-y^2=\left(x-2-y\right)\left(x-2+y\right)\)

c: \(\left(x^2+9\right)^2-36x^2=\left(x+3\right)^2\cdot\left(x-3\right)^2\)