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Foil Formula

Foil is an acronym of First Outer Inner Last. This is used to find out the product of two terms. In this method, first we have to multiply the first term with the first term of the second bracket then multiply the first term in the first bracket with the second term in the second bracket. Next we have to multiply both terms in the second bracket with second term in the first bracket. Add all these values to get the solution. For better understanding, let us see the given figure.
Foil Method

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Foil Problems

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Solved problems related to foil method are given below:

Solved Examples

Question 1: Evaluate (2x+4)(5x+3) ?
Solution:
 
Given function is, (2x + 4) (5x + 3)
According to foil formula,
(2x + 4) (5x + 3) = (2x * 5x + 2x * 3) + (4 * 5x + 4 * 3)
(2x + 4) (5x + 3) = 10$x^{2}$ + 6x + 20x + 12
(2x + 4) (5x + 3) = 10$x^{2}$ + 26x + 12

 

Question 2: Evaluate (3x-1)(x+5) ?

Solution:
 
Given function is, (3x - 1)(x + 5)
According to foil formula,
(3x - 1) (x + 5) = (3x * x + 3x * 5) + (-1 * x - 1 * 5)
(3x - 1) (x + 5) = 3$x^{2}$ + 15x - x - 5
(3x - 1) (x + 5) = 3$x^{2}$ + 14x - 5
 

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