Solve the perimeter formula for an isosceles triangle, P = 2a + b for a. a = P + 2b

a = P – 2b

The solution for a is a =  

Step-by-step explanation:

To solve an equation for one of its variables, do that

Let us solve the question

∵ The perimeter formula for an isosceles triangle is P = 2a + b

∵ We need to solve it for a

→ By using the first step above, subtract the two sides by b to move it

    from the right side to the left side

∵ P - b = 2a + b - b

∴ P - b = 2a

→ By using the second step above, divide both sides by 2

∵ =

∴   = a

→ Switch the two sides

∴ a =  

∴ The solution for a is a =  

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step-by-step explanation:

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