Question

A)7(x+3)=4x-2
B)7(x-3)=4x+2
C) X²-2x ,para x=-7
D) x²+3x, para x=-8
E)2x²-2x ,para x=-5

Answer 1

A)7(x+3)=4x-2 ==> 7x + 21 = 4x - 2 ==> 7x - 4x = - 2 - 21==> 3x=-23 ==> x = - 23/3

B)7(x-3)=4x+2 ==> 7x - 21 = 4x + 2 ==> 7x - 4x = 2 + 21==> 3x= 23 ==> x = 23/3

C) X²-2x ,para x=-7==> (-7)^2 - 2(-7) ==> 49+14==> 63

D) x²+3x, para x=-8 ==> (-8)^2 + 3(-8) ==> 64+24==> 88

E)2x²-2x ,para x=-5 ==> 2(-5)^2 - 2(-5) ==> 50+10==> 60