Question

ayuda porfavor es para mañana ​

Answer 1

Explicación paso a paso:

3.

a. (2a - 5)(2a + 6) = 4a² + 12a - 10a - 30 = 4a² + 2a - 30

b. (a - 3b)(a + x) = a² + ax - 3ab - 3bx

c. (1/9m + 2/7n)(1/9m - 1/3) = 1/81m² - 1/27m + 2/63mn + 2/21n

4.

(2x + 12)(2x + 12) = 4x² + 24x + 24x + 144 = 4x² + 48x + 144

(4x + 2)(4x - 2) = 16x² - 8x + 8x - 4 = 16x² - 4

(6x + 3)(6x + 4) = 36x² + 24x + 18x + 12 = 36x² + 42x + 12

(2x - 6)(2x - 6) = 4x² - 12x - 12x + 36 = 4x² - 24x + 36