102 2 • (2a + 3) - ——— = 0 5 STEP 5 : Rewriting the whole as an Equivalent Fraction
5.1 Subtracting a fraction from a whole
Rewrite the whole as a fraction using 5 as the denominator :
2 • (2a + 3) 2 • (2a + 3) • 5 2 • (2a + 3) = ———————————— = ———————————————— 1 5 Equivalent fraction : The fraction thus generated looks different but has the same value as the whole
Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator
Adding fractions that have a common denominator :
5.2 Adding up the two equivalent fractions Add the two equivalent fractions which now have a common denominator
Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:
7.1 When a fraction equals zero ... Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.
Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.
Here's how:
4•(5a-18) ————————— • 5 = 0 • 5 5 Now, on the left hand side, the 5 cancels out the denominator, while, on the right hand side, zero times anything is still zero.
The equation now takes the shape : 4 • (5a-18) = 0
Equations which are never true:
7.2 Solve : 4 = 0
This equation has no solution. A a non-zero constant never equals zero.
Solving a Single Variable Equation:
7.3 Solve : 5a-18 = 0
Add 18 to both sides of the equation : 5a = 18 Divide both sides of the equation by 5: a = 18/5 = 3.600
