Solve |7x+21| =14x identify the solution and extraneous solution.

a) solution: x=3;
extraneous solution x=-3

b) solution x=3;
extraneous solution: x=-1

c) solution: x=-1
extraneous solution: x=3

d) solution: x=1
extraneous solution: x=-3

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

ab will be equal to

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice