Question

Determine by substitution, if:
(a) 5 is the root of x - 3 = 6.
(b) 3 is the root of 3x = 9.
(c) 4 is the root of 2x - 3 = 5.
(d) -3 is the root of 2(x + 4) = 14.​

Answer 1

here (b) and (c) r true and (a) and (d) r not true...

u have to put the values of x here(root means value of x at which statement is true)

(a) x-3=5-3=2≠6

=>not true

(b) 3x=3*3=9=9

=> true

(c)2x-3=2*4-3=8-3=5=5

=>true

(d)2(x+4)=2(-3+4)=2(1)=2≠14

=>not true

hope it help:-D

Answer 2

Answer:

(d) -3 is the root of 2(X + 4) = 14

solutions = given: 2( X + 4 ) = 14

=. X = -3

substitute X = -3 in given equation

2(-3+4)=14

2x1=14

2= 4

LHS =RHS

then X = -3 is not root of the given equation