Question

Resuelve y simplifica:
5. (x - 1)( x - 2) + (x + 3)(x - 5) =
6. (7a + 3b) (7a – 8b) + (a – b) (a – 4b) =

ayudaaaaaaaaa

Answer 1

Respuesta:

Explicación paso a paso:

(x+a)(x+b)=x²+(a+b)x+ab

(x - 1)( x - 2) + (x + 3)(x - 5)

x²+(-1-2)x+(-1)(-2) + x² + (3-5)x + (3)(-5)

x²-3x+3+x²-2x-15

2x²-5x-12

(7a + 3b) (7a – 8b) + (a – b) (a – 4b)

(7a)²+(3b-8b)a+(3b)(-8b) + a²+(-b-4b)a+(-b)(-4b)

49a²-5ab-24b²+a²-5ab+4b²

50a²-10ab-20b²