Foil stands for:
F = First
O = Outer
I = Inner
L = Last
It is the method used to perform multiplication. It finds the product of the two terms. It gives the result instantly by using the Foil Calculator.
Steps to use the Foil method by Foil Calculator:
Apply Foil rule to multiply the terms in a specific order that is First, Outside, Inside, Last. Foil method is used to multiply two binomial equations and not for polynomials. For example:
Multiply the two binomials using FOIL method,
(3x-4) and (2x+1)
Binomial equation = (6x2 + 3x - 8x – 4) = 6x2 _ 5x - 4
Step 1: 2x × 3x = 6X2
Step 2: 2x × 4 = 8x
Step 3: 3 × 3x = 9x
Step 4: 3 × 4 = 12
Step 5: 6x2 + 8x + 9x + 12.
Answer: 6x2 + 17x + 12
Step 1: Let x be the width of the frame.
Length and Width of the picture frame are 17 + 2x and 11 + 2x respectively.
Step 2: Since area of picture frame = 315 cm2
=> (17 + 2x)(11 + 2x) = 315 (Because area of rectangle = Length * Width)
Step 3: 17(11 + 2x) + 2x(11 + 2x) = 315 (Foil method)
187 + 34x + 22x + 4x2 = 315
4x2 + 56x + 187 = 315
4x2 + 56x - 128 = 0
4(x + 16)(x - 2) = 0 (Factorized)
x + 16 = 0 and x - 2 = 0
x = -16 and x = 2
Step 4: Length can't be negative. So our value is x = 2.
Step 5: Width of the frame is 2 cm.
Answer: 2 cm.
Uses of Foil Calculator:
The Foil method is an easy method to perform the multiplications just by following the steps irrespective of the numbers, whether it’s a fraction or a negative sign.
Some useful links
This website shows the working of the Foil calculator. Also the image available on the site elaborates the method of the calculator.
Here you can learn about the method of Foil calculator by putting the figures of your choice. It helps you to learn how to expand the two binomials.
Free math help is a very basic site to understand the method or you can say it is for the beginners. To start with, you may visit this website.
This site is also useful for reading and analyzing more problems related to Foil calculator.
Free math help is a very basic site to understand the method or you can say it is for the beginners. To start with, you may visit this website.>
Here online calculator is accessible to solve your problems on Foil calculator.
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