Question

Ecuaciones cuadráticas

(x-5)(x+8)=x²+

(a + 2)(a + 4)=a²+6a+

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Answer 1

(x-5)(x+8)=x²+

(x-5)(x+8)

(a+b)(c+d) =ac+ad+bc+bd

a=x,b=-5,c=x,d=8

=xx+x*8+(-5)x+(-5)*8

+(-a)=-a

xx+8x-5x-5*8

x^2+3x-40

x^2+3x-40+40=x^2+40

x^2+3x=x^20+40

x^2+3x-x^2=x^2+40-x^2

3x=40

3x/3=40/3

solución uno 40/3

(a + 2)(a + 4)=a²+6a+

aa+a*4+2a+2*4

aa+4a+2a*4

a^b*a

^c=a^b+c

aa=a¹+¹

a^2

2*4=8

a^2+6a+8= a^2+6a

a^2+6a-(a^2+6a)=a²+6a-8-(a^2+6a)

sin solucion

0=-8