Thread: explaination required

Use the substitution to solve the equation

the problem i need explaining is the first part involving the subsitution for . how does become




.....

i can see how the rest of the problem is solved as i have the solution

many thanks

Originally Posted by decoy808

Use the substitution to solve the equation

the problem i need explaining is the first part involving the subsitution for . how does become




.....

i can see how the rest of the problem is solved as i have the solution

many thanks

Because .