Question

What value of b will make the expressions −12.8x+b and −3.2(4x−2.1)+2.4 equivalent?

Answer 1

$- 12.8x + b = - 3.2(4x - 2.1) + 2.4$

Distribute -3.2 through the parentheses

$- 12.8x + b = - 12.8x + 6.72 + 2.4$

Cancel equal terms on both sides of the equation

$b = 6.72 + 2.4$

Add the decimals

$b = 9.12$

Thus, The expression are equivalent at b = 9.12...~