book Maths Puzzle Numerical Ability

Explain how to multiply two binomials using the FOIL method.

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book Other Question

what does r equal in this equation : 8r+3=5r+12?
also what does p equal in this equation : 9p-14=4p+11? Factor Each trinomial, if possible--cannot using integers write prime

2). 16r^2-8r+1

4). 6x^2 + 5x-6