Question

Find the value of the expression 3x-5-x+9, when the value of x=3
Find the value of the expression 3a+5-8a+1, when the value of a= -1
Find the value of the expression 2a-2b-4-5+a, when the value of a= -1 and b= -2
What should be the value of a if the value of 2x²+s-a equals to 5, when x=0?

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Answer 1

Answer:

Given expression 3x-5-x+9

Value of x=3

Putting the value of x in given expression

3*3-5-3+9= 9-5-3+9= 18-8= 10.

Given expression 3a+5-8a+1

Value of a= -1

Putting the value of a in expression

3*-1 + 5 - 8*-1 + 1 = -3+5+8+1 = 14-3 = 11.

Given expression 2a-2b-4-5+a

Value of a= -1 and b= -2

Putting the values in the expression

2*(-1) - 2*(-2) - 4 - 5 +(-1) = -2+4-4-5-1 = -12+4 = -8

Given expression 2x^2 + s-a =5

Value of x=0

Putting the value of x in expression

2(0) + s-a =5

s-a = 5

-a = 5 - s

a= -5+s